1000 Sentences With "labellum" | Random Sentence Generator

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The plant is pollinated by insects. The labellum is held above the flower by a sensitive strap-like stalk. When touched, the labellum turns rapidly downward, trapping a visiting insect between the labellum and column wings.

This orchid is pollinated by insects. The labellum is held above the flower by a sensitive strap-like stalk. When touched, the labellum turns rapidly downward, trapping a visiting insect between the labellum and column wings.

The labellum is long and wide, and creamy yellow with a dark red tip. The sides of the labellum have many short red teeth and the tip of the labellum curves downwards. There are four or six rows of crowded, shiny red calli along the labellum mid-line. Flowering occurs in September and October.

The lateral sepals are about long and curve around the labellum. The petals are a similar size to the lateral sepals and are partly enclosed by the labellum. The labellum is cup- shaped, fleshy and about long and wide. Flowering occurs from September to December.

The labellum is about long on the end of a strap-like stalk about long. The labellum is flattened and only about one-third of the outer part of the labellum is covered with glossy black glands or calli. Flowering occurs from October to December.

The labellum is long, wide and blue with dark blue bars. The sides of the labellum curve upwards and the small tip turns downwards. There are two rows of yellow-tipped calli along the mid-line of the labellum. Flowering occurs from July to September.

The labellum has a downward pointing spur and two stalked glands that resemble tonsils or testicles. Orchids in this genus are distinguished from those in other similar genera by the labellum glands, labellum spur and by having petals which are shorter than the sepals.

The labellum is usually simple, but is occasionally bifurcated at the tip of the midrib. The labellum of Corsia is similar in appearance to the labellum of some orchids, but is not homologous to them; in orchids the labellum is formed from an inner tepal (petal), but in Corsiaceae it forms from an outer tepal (sepal). In Corsia, unlike the orchids, all six stamens are fertile.

The sides of the labellum curve upwards and have short blunt teeth on their sides and the tip of the labellum curves downwards. There are two rows of cream-coloured, anvil-shaped calli along the centre of the labellum. Flowering occurs from September to mid-October. This subspecies differs from subspecies pendens in having darker coloured sepals and petals, shorter petals and a shorter labellum.

The callus in the centre of the labellum is greenish, wrinkled and extends almost to the tip of the labellum. Flowering occurs in November and December.

The sides of the labellum curve upwards and have erect teeth up to long on their sides and the tip of the labellum curves downwards. There are four or more rows of pink calli along the centre of the labellum. Flowering occurs from November to early January.

The sides of the labellum curve upwards and have short blunt teeth on their sides and the tip of the labellum curves downwards. There are two rows of cream-coloured, anvil-shaped calli along the centre of the labellum. Flowering occurs from August to early October.

The upturned part of the labellum is crinkled and there is a yellowish-green callus in the centre of the labellum. Flowering occurs in September and October.

'exserted labellum'. The specific epithet (exserta) is a Latin word meaning "projecting" or "thrust forth", referring to the way the labellum is raised above the lateral sepals.

The petals are similar to the sepals but somewhat shorter. The labellum curves forward with the tip rolled under, and is broad lance-shaped to egg-shaped, dark purplish, long and wide. The sides of the labellum are fringed with linear teeth up to nearly long, decreasing in length toward the tip of the labellum. There are four to six rows of foot-shaped calli along the centre of the labellum and these are also about long near the base of the labellum and decrease in length towards its tip.

The labellum is long, wide and dark blue with fine darker lines and spots. The sides of the labellum curve upwards, surrounding the column and almost touching. The labellum has a short, more or less triangular down-curved tip with about five short teeth on each side and there are two rows of cream-coloured calli along the mid-line of the labellum. Flowering occurs from August to early October.

The lateral sepals and petals have about the same dimensions as the dorsal sepal although the lateral sepals are slightly wider. The labellum is long and wide and reddish- mauve with darker bars. The sides of the labellum curve upwards but without surrounding the column. The labellum has a white and yellow down-curved tip and there are two rows of stalked yellow calli along the mid-line of the labellum.

The sides of the labellum curve upwards and have four or five thin teeth up to long and the tip of the labellum is curved under. There are four crowded rows of dark red calli up to longin the centre of the labellum. Flowering occurs from November to December.

The labellum is large and fleshy with an upper epichile separated by a groove from the lower concave hypochile. The labellum has a rigid connection to the column.

The edges of the labellum are white and wavy and there is a light green callus in the centre of the labellum. Flowering occurs from December to February.

Showy lady slipper (Cypripedium reginae) has a pink labellum P: Petalum S: Sepalum L: Labellum In botany, the labellum (or lip) is the part of the flower of an orchid or Canna, or other less-known genera, that serves to attract insects, which pollinate the flower, and acts as a landing platform for them. Labellum (plural: labella) is the Latin diminutive of labrum, meaning lip. The labellum is a modified petal and can be distinguished from the other petals and from the sepals by its large size and its often irregular shape. It is not unusual for the other two petals of an orchid flower to look like the sepals, so that the labellum stands out as distinct.

The labellum is curved with the tip rolled under and has erect lateral lobes. It is about long and wide when flattened. The edges of the labellum are scalloped and the middle lobe has short, broad teeth. There are six rows of stalkless calli along the centre of the labellum.

The labellum is long, about wide with a shallow, pouch-like base. The tip of the labellum has two lobes with toothed edges. Flowering occurs from October to November.

The lateral sepals are long and about wide and spread apart from each other, curving downwards. The petals are long and about wide and arranged like the lateral sepals. The labellum is long, about wide and white with dark red markings. The sides of the labellum have short, broad teeth, the tip of the labellum is curled under and there are two rows of red, anvil- shaped calli along the mid-line of the labellum.

The labellum is long and wide and white with the tip rolled under. The sides of the labellum have long, forward-facing white or red linear teeth decreasing in size towards the front of the labellum. There are four to six rows of yellow or red hockey stick-shaped calli up to long along the centre line of the labellum but decreasing in size towards the tip. Flowering occurs from September to October.

The lateral sepals are long and wide and spreading widely but with drooping tips. The petals are long and wide and arranged like the lateral sepals. The labellum is long, wide and white to cream-coloured. The sides of the labellum have teeth up to long, the tip of the labellum is curled under and there are four or six rows of calli up to long, along the mid-line of the labellum.

The sides of the labellum have lobes which are erect and partly enclose the column and the front part of the labellum has between 12 and 14 teeth on each side. The tip of the labellum is curved downward and there are about two irregular rows of calli up to 1 mm long, with orange or yellow tips, along the mid-line of the labellum between the lateral lobes. Flowering occurs from October to December.

The labellum is egg-shaped to heart-shaped, about long and wide with teeth up to but decreasing in size towards the front of the labellum. There are four to six rows of calli, shaped like golf stick heads on the centre of the labellum. Flowering occurs from late August to November.

The lateral sepals are linear, about long, and turn upwards towards the base of the labellum. The petals are about long and hidden by the labellum. The labellum is mostly hidden by the dorsal sepal, tube shaped near its base, about long, wide, translucent white and hairy. Flowering occurs from March to July.

The labellum is also free, attached at the base of the column by a short stalk or "claw". The labellum is curved and has a narrow central band of yellow calli.

The lateral sepals are often joined near their bases and the lateral petals are shorter and narrower than the sepals. As is usual in orchids, one petal is highly modified as the central labellum, much different from the other petals and sepals. The labellum is above the column and joined to it by a flexible attachment, so that the labellum vibrates in a breeze. The edge of the labellum sometimes has fine teeth, glands or hairs.

The labellum is 7–9 mm long and about 7 mm wide, and white to pale pink with dark pink bars. The tip of the labellum curves downwards with six to eight short teeth and each side and two rows of yellow calli in the centre of the labellum. Flowering occurs in May to July.

The lateral sepals are white, linear, about long, wide and held horizontally below the labellum. The petals are white, linear, about long, wide and curve around the labellum. The labellum is tube-shaped, reddish, long, wide and has three lobes, the middle one projecting under the dorsal sepal. Flowering occurs from September to November.

The lateral sepals are long and wide and spread stiffly apart. The petals are long, wide and arranged like the lateral sepals. The labellum is long and wide, and white. The sides of the labellum have many red, linear teeth up to long with white tips, and the tip of the labellum curves downwards.

About one half of the outer part of the labellum is covered with glossy black glands or calli and the labellum has a slightly humped top. Flowering occurs in September and October.

About one-third of the outer part of the labellum is covered with glossy black glands or calli and the labellum has a flattened top. Flowering occurs from late October to January.

The labellum has three or four spreading lobes and in most species there is a spur at the base. Unlike similar orchids, the labellum of Calanthe orchids is fused to the column.

The tip of the labellum curls downward and there are four or six rows of purplish, stalked calli along the mid-line of the labellum. Flowering occurs in late August and September.

About one fifth of the outer part of the labellum is covered with glossy black glands or calli and the labellum has a slightly humped top. Flowering occurs in August and September.

The lateral sepals are long and wide and the petals are long and wide. The labellum is long, wide, bluish-mauve and relatively flat apart from a down- curved tip. The sides of the labellum have minute teeth and there are many scattered, bead-like calli scattered over the labellum. Flowering occurs from October to early November.

The lateral sepals and petals have about the same dimensions as the dorsal sepal. The labellum is long, wide, pale yellow or white with purple stripes. The sides of the labellum have short teeth, the tip curves downwards and there are many rows of short bead-like calli covering the labellum. Flowering occurs from September to October.

The lateral lobes of the labellum are erect and surround the column while the central part has six to eight short, purplish-black teeth on each side. The tip of the labellum is curved downward and there are two rows of dark purplish-black, stalked calli along the mid-line of the labellum. Flowering occurs in October.

The lateral sepals are linear, about long and wide, tapered and held horizontally or turned upwards towards the labellum. The petals are about long and hidden behind the labellum. The labellum is translucent white with red blotches and tube-shaped near its base. The tube is about long then expanded into a flat area long and wide.

The lateral sepals are long and wide, spread apart and turned downwards or drooping. The petals are long and wide and arranged like the lateral sepals. The labellum is cream-coloured or reddish, long and wide. The sides of the labellum have white or reddish teeth up to long and the tip of the labellum is curled under.

The labellum is dull pink with dark red bars and a yellow tip and is long and wide. The sides of the labellum have four to six short teeth near the tip as it curls under. There are two rows of white or yellow calli along the mid-line of the labellum. Flowering occurs in October and November.

The sides of the labellum have short, blunt, forward-facing, white to deep brown teeth, decreasing in size towards the front of the labellum. There are four or six rows of glossy red hockey stick-shaped calli up to long along the centre line of the labellum for about half its length. Flowering occurs from September to October.

The petals are long, wide and sometimes curve downwards. The labellum is long and wide, greenish-cream with a red tip which is turned under. The sides of the labellum have many thin teeth up to long which are often split. There are four rows of dark red calli up to long, along the centre of the labellum.

About one-third of the outer part of the labellum is covered with glossy black glands or calli and the labellum has a flattened top. Flowering occurs from late October to early December.

This species is similar to D. roseum but that species has converging keels on the labellum and lacks the dense patch of tangled hairs near the tip of the labellum of D. variegatum.

The labellum is attached to the column by a flexible "claw" which bends under the weight of a pollinating wasp. The column has broad wings and when the labellum is touched, it rapidly turns down, trapping a visiting insect between the labellum and column wings so that the insect comes into contact with the sexual parts of the column. The labellum is flask- shaped, narrowing near the end with the narrow end covered with small raised calli or glands which are usually black, but may be maroon or greenish. In some species the calli may cover a greater part, or even all of the labellum (as in P. minor).

The upturned part of the labellum is wavy or crinkled and there is a yellowish-green callus with a dark green base, in the centre of the labellum. Flowering occurs in September and October.

The labellum is a rolled reddish brown, purplish or yellowish tube-like structure measuring long by across. There is a dark purple callus ending in two knobs on the lower side of the labellum.

The labellum is about long, wide, thick and fleshy with a pointed tip. There is a callus in the centre of the labellum and extending nearly to its tip. Flowering occurs from November to January.

About one-half to one-third of the outer part of the labellum is covered with glossy black glands or calli and the labellum has a flattened top. Flowering occurs from late October to November.

The labellum is linear to egg-shaped, long, turns upwards and has slightly wavy edges. There is a fleshy, yellowish-green callus in the centre of the labellum. Flowering occurs in late October and November.

The tip of the labellum curls downward and there are four or six rows of purplish-red, stalked calli up to long along the mid-line of the labellum. Flowering occurs in August and September.

The upturned part of the labellum has wavy edges and there is a raised, centrally grooved callus in the centre of the labellum and extending just past its bend. Flowering occurs in November and December.

The labellum is long and dark- reddish pink with mauve hairs.

The dorsal sepal is erect, to slightly curved forward, the lateral sepals and petals are held horizontally or slightly downwards. The labellum is long, about wide and white or (rarely) cream-coloured with faint red bars. The sides of the labellum turn upwards and partly embrace the column and there are four to six blunt teeth on the edges near the front, with the tip of the labellum curled under. There are two rows of pale yellow calli along the centre of the labellum.

The labellum is broadly lance-shaped to egg-shaped, wide and wide and dark red. The labellum curves downwards and there are five to seven pairs of linear, dark purplish teeth long on its sides. The mid-line of the labellum has four or six rows of reddish black calli, the longest of which are . Flowering occurs in September and October.

The labellum is 6–8 mm long, 5–7 mm wide and white with pink to mauve edges. The sides of the labellum turn upwards and the tip has 8 to 14 yellow to orange teeth on each side and curls downward. There are two rows of red to orange calli along the centre of the labellum. Flowering occurs from August to September.

The labellum is long, wide and spotted with purple. The sides of the labellum curve upwards to surround the column, and the short tip curls downward with short teeth on its sides. There are four or six rows of purple calli along the mid-line of the labellum. Flowering occurs from August to early October and is much more prolific after summer fires.

The lateral sepals are long, wide and the petals are long and wide. The labellum is long, wide and usually white with pink margins. The sides of the labellum curve up strongly and the tip curls downwards, and is orange-yellow with narrow teeth on the edge. There are two rows of calli with clubbed heads in the centre of the labellum.

The labellum is long, wide and green and white with a dark red tip which is curled under. The sides of the labellum curve up strongly and have five or six teeth up to long on each side. There are four rows of dark red, club-shaped calli up to long in the centre of the labellum. Flowering occurs from October to November.

The lateral sepals are long, wide and spread widely, turning slightly downwards. The petals are long, wide and arranged like the lateral sepals. The labellum is long, wide and pale pink near its base but darker pink near its edges and tip. The sides of the labellum have linear teeth up to long and the tip of the labellum is curled under.

The labellum is white, long and wide with a few reddish brown markings. The labellum has three lobes, the side lobes erect and the middle lobe with a short tooth. Flowering occurs between June and December.

The sides of the labellum have yellowish, linear teeth up to long and there are four rows of red calli up to long, along the mid-line of the labellum. Flowering occurs from September to October.

The sides of the labellum have a few narrow teeth near the tip and there are two short rows of yellow or white calli in the centre of the labellum. Flowering occurs from September to October.

The labellum is long and wide with three lobes, the side lobes arranged at about 90° to the middle lobe. The labellum spur is white, long, about wide and curves forward. Flowering occurs between January and April.

The labellum turns sharply upwards and often backwards near its middle. The edges of the upturned part of the labellum are wavy and there is a greenish callus in its centre. Flowering occurs from September to November.

The edges of the labellum are crinkled and there is a pale green, fleshy callus along the centre of the labellum, extending almost to its tip. Flowering occurs from September to November and is stimulated by earlier fires.

There are four or five pairs of thin teeth long on the sides of the labellum and four densely crowded rows of calli up to long in the centre of the labellum. Flowering occurs from November to January.

The sides of the labellum have short, blunt teeth and the tip is curled under. There are two rows of anvil-shaped, cream-coloured calli along the mid-line of the labellum. Flowering occurs from September to October.

The petals are about long and wide. The labellum has three lobes. The side lobes are tapered, long with their tips curved upwards and the middle lobe is about long. The labellum spur curves forwards and is long.

The labellum is white, more than wide and the column is a less than long. There are four or more rows of pale red calli in the centre of the labellum. Flowering occurs from August to early October.

The petals are slightly shorter than the sepals and taper to a thin, pointed end. The labellum is long, wide when flattened, partly red and yellowish-cream coloured near its base. The sides of the labellum have linear teeth up to long, decreasing in size towards the front. There are four or six rows of flattened calli along the centre of the flat part of the labellum.

The lateral sepals are long and the petals are about long, all in close contact with the labellum. The labellum is about as long as the dorsal sepal, tube-shaped and has three lobes. There are crowded rows of pink to red calli about long in a ridge about wide around the edge of the labellum. Flowering occurs from early May to mid June.

The dorsal sepal is spoon-shaped and bulbous, long, wide and smaller than the labellum. The lateral sepals are white, narrow linear, long and the petals are similar but only half as long. The labellum is about long, entirely purple and tube-shaped with the opening pointing downwards and forwards and about wide. There are a few small teeth on the edge of the labellum.

The labellum is lance-shaped to egg-shaped, long and wide and dark red to maroon or green with a maroon tip. The labellum curves forward and there are five to twelve pairs of linear, dark purplish-red teeth on its sides. The mid-line of the labellum has four rows of calli, the longest of which are and shaped like hockey sticks. Flowering occurs in October.

The labellum is lance-shaped to egg- shaped, long and wide with erect lateral lobes. The labellum curves forward and there are five to nine pairs of linear teeth long on its sides. The mid- line of the labellum has many crowded calli near its base and four or six rows near its centre, the longest of which are long. Flowering occurs in September.

The labellum is longer than the dorsal sepal and forms a tube about long near its base, before curving and flattening into a concave dish shape, long and wide. The upper part of the labellum is reddish purple grading to white from the centre down. There are teeth or serrations up to long around the edges of the labellum. Flowering occurs in July and August.

As is usual in orchids, one petal is highly modified as the central labellum, differing markedly from the other petals and sepals. The labellum is positioned above the column and rigidly attached to its base. Its edges are usually wavy and rolled back. The labellum has a callus which consists of a raised, fleshy plate which is usually channelled, with the base forming an inverted basin shape.

The dorsal sepal curves forward and is long and about wide. The lateral sepals are long, wide, and curve downwards. The petals are long and wide and arranged like the lateral sepals The labellum is long, wide and white or cream coloured. The sides of the labellum curve upwards and have erect teeth up to long on their sides and the tip of the labellum curves downwards.

The petals are long, wide and spread fan-like with the lateral sepals. The labellum is long and wide, and pink with reddish bars. The sides of the labellum turn upwards and the tip is curled under. There are four to eight long teeth on each side of the labellum near its tip and four to six rows of large, club-shaped calli along its mid-line.

The petals are long and wide. The lateral sepals and petals are held close to horizontally. The labellum is long and wide and is cream-coloured with red cross-bars and a yellowish tip. The sides of the labellum have a few short teeth near the tip and there are two short rows of yellow calli with red stalks in the centre of the labellum.

The petals are similar but slightly shorter, and narrower at the base. The labellum is egg-shaped when flattened with an elongated tip that curls under, long and wide. The edges of the labellum have reddish teeth up to long and there are four or six rows of dark reddish-purple, foot-shaped calli along the centre of the labellum. Flowering occurs from August to September.

The petals are sepals are separate from each other. As is usual in orchids, one petal is highly modified as the central labellum. The labellum is shaped like a wingless insect, and is attached to the base of the column by a flexible, hinge-like "claw". The labellum is much smaller than in other orchids and is rod-like, fleshy and has many club-shaped hairs.

The tip of the labellum curls downward and there are six rows of purplish, mostly stalked calli along the mid-line of the labellum, the longest long and shaped like hockey sticks. Flowering occurs in late August and September.

The labellum is dark red to dark maroon, about long and wide with three fleshy lobes. There is an oblong hyopchile at the base of the labellum and a heart- shaped upper epichile. Flowering occurs from November to April.

Its flowers can be green, but it is a rare occurrence. Each flower has a labellum that is wide, flat, and nearly translucent. The labellum is pale purple and has darker veins. The fruit is smaller than the pedicels.

The labellum is dark blue near its tip, white near the base, long, wide. The edge of the labellum is fringed and there are many stalked calli, giving rise to the name blue beard . The column is long, wide.

The labellum quivers in the slightest breeze. Flowering occurs between December and May.

The labellum is reddish-purple, usually with dark markings reaching to the edges.

The labellum sometimes has three lobes and usually has a sac-like spur.

The labellum is dark red, egg-shaped with the narrower end towards the base, about long, wide and turns sharply upwards near its middle. There is a small callus in the centre of the labellum. Flowering occurs in February and March.

The labellum is lance-shaped to egg-shaped, long, about wide with the outer end turned upwards at 90° and wavy edges. There is a fleshy, greenish callus in the centre of the labellum. Flowering occurs from September and October.

The labellum is green or brown, thin and insect-like, long and about wide. The edges of the labellum are wavy, with short, bristly hairs and there are two longer bristles near the "head" end. Flowering occurs from December to January.

The labellum is long, wide and greenish cream with reddish markings. The labellum has three lobes, the side lobes curving upwards near their tips and the middle lobe with a short tooth on its midline. Flowering occurs between June and January.

The labellum is flat, oval, about long wide with two round calli at the base and two parallel longitudinal ridges. The column is shorter than the labellum and has two wings widening towards the tip. Flowering occurs from July to November.

The lateral sepals and petals linear, about long, wide and curve around the side of the labellum. The labellum is reddish, forms a tube long, about wide with glistening dark red calli along its centre. Flowering occurs in June and July.

The labellum is egg-shaped, whitish or pinkish, long, wide, sometimes with small, irregular teeth on the edges. There is a blackish callus in the centre of the labellum and extending almost to its tip. Flowering occurs between January and May.

The labellum is egg- shaped, long, wide with densely hairy edges and a sharply pointed tip. There is a callus in the centre of the labellum and along about three-quarters of its length. Flowering usually occurs between February and April.

Their description was published in Australian Systematic Botany. The species is "named from the Latin confluens (confluent, running together)" referring to the labellum of this species having a labellum intermediate in form between those of D. livida and D. elastica.

The labellum is heart-shaped, mostly white, long and wide and the column is a relatively long . There are four or more rows of pale red calli in the centre of the labellum. Flowering occurs from August to early October.

In the case of some tropical species, the wasps struggle so violently with the labellum that the organ is often torn off. Some other orchids similarly employ thynnid wasps as pollinators but only Arthrochilus flowers have restraining hooks on the labellum.

The lateral sepals are long, about wide, with a humped base and spread apart from each other. The petals are about long and wide with a few hairs on their edges. The labellum is purple, about long, wide with coarse hairs up to long and the labellum vibrates in the slightest breeze. There is a callus in the centre of the labellum but not extending to its tip.

The dark-coloured labellum is egg-shaped, about the same size as the petals with a minutely wavy edge. The callus is narrow egg-shaped and extends almost to the tip of the labellum. The column, which is below the labellum has wings with a rough surface. Flowering occurs between February and May and the fruit that follows is a non-fleshy, dehiscent capsule containing hundreds of seeds.

The petals taper to a point and lack club-like tips. The labellum is reddish with a greenish-cream base, long and wide with the sides curved upwards and the tip curled under. The sides of the labellum have triangular teeth about long, decreasing in size towards the tip. There are four rows of calli about long near the base of the labellum and tapering towards the tip.

The petals are 30–55 mm long, 3–5 mm wide and arranged like the lateral sepals. The labellum is 15–23 mm long, 10–11 mm wide and dark pink. The sides of the labellum have thin teeth up to 6 mm long, the tip of the labellum curls under and there are four rows of pink calli up to 2 mm long, along the mid-line.

The lateral sepals are long, about wide and spread apart from each other, curving downwards. The petals are long, about wide and arranged like the lateral sepals. The labellum is long, wide and whitish with a dark red, downcurved tip. The sides of the labellum have red teeth and there are four or six rows of dark red calli up to long, along the mid-line of the labellum.

The petals are long and wide at the base, spread widely near the base then incline downwards. The labellum is white or pale yellow with maroon stripes, spots and blotches. It is comparatively small, diamond-shaped, long and wide and curves downward at the front. The sides of the labellum curve upwards and have a fringe of small teeth decreasing in size towards the front of the labellum.

There is a glandular tip about long on the end of the all three sepals. The petals are egg-shaped to lance-shaped, long, wide, spread apart from each other and curve upwards near the labellum. The labellum is broadly egg-shaped to heart-shaped, long and wide. There are up to 24 erect, dark reddish, column like calli up to long, the longest nearer the base of the labellum.

The flower is also similar to those of other hammer orchids in that the labellum resembles a flightless female thynnid wasp, in this case Zaspilothynnus nigripes. This species can be distinguished by the pointed column, the pointed, upturned end of the labellum and the swollen labellum body. The sepal at the back of the flower is long and the two at the sides are . The petals are also long.

The labellum is pale yellow to white and lacks the red tip common to similar spider orchids. The sides of the labellum have narrow teeth or calli which have a "clubbed" end. There are four or more rows of red-tipped calli along the centre of the labellum. Flowering occurs between September and October and is followed by a non- fleshy, dehiscent capsule containing a large number of seeds.

The petals are long and wide and arranged like the lateral sepals. The labellum is long, wide and white or pale to deep pink with narrow red teeth up to long on the sides. The tip of the labellum is curled under and there are four rows of pink calli up to long, along the mid-line of the labellum. Flowering occurs from September to October, more prolifically after summer fires.

The inflorescence is a simple raceme with only 10 to 12 pale yellow flowers with purple streaks on the labellum. The sepals are long by wide and petals are long by wide. The four lobes of the labellum are rounded and the spur is forward-projecting. Oeceoclades flavescens is similar to O. pulchra but it is very distinctive in the papery leaves and the morphology of the labellum.

The petals are lance-shaped to narrow egg-shaped, long, wide on a blackish stalk long and are directed sideways. The labellum is long and has three lobes. The centre lobe is egg-shaped to heart-shaped, long and wide and the side lobes are oblong to wedge-shaped, long and wide. The labellum callus is densely hairy or pimply near its base and tapers towards the tip of the labellum.

The labellum is broadly lance-shaped to egg-shaped when flattened and is coiled forward at the tip, long and wide. There are 13 to 18 pairs of narrow, linear teeth up to along the edges of the labellum. There are four to six rows of erect, hockey stick-shaped calli along the centre of the labellum. The column is long, about wide and yellow and has broad wings.

The front of the petals and sepals is glabrous. The labellum is broadly egg-shaped, about long and mostly white, sometimes with a dark red or purplish tip. The sides of the labellum have thin, finger-like teeth along most of their length. There are four rows of club-shaped, white to yellow calli along the mid-line of the labellum, becoming clumped and purple near its tip.

The labellum is not lobed but has a pouch or spur at its base.

The labellum is relatively broad and has a band of calli along its midline.

The labellum is sometimes lobed but always has prominent ridges on its upper surface.

The labellum ranges from long and from wide. Flowering occurs between April and November.

The labellum is stiffly attached to the base of the column and lacks lobes.

The flower is also similar to those of other hammer orchids in that the labellum resembles a flightless female thynnid wasp, except that in this species the column is pointed, the labellum lacks an upturned end and the main body of the labellum has long hairs and a longer narrow "neck". The sepal at the back of the flower is long and the two at the sides are . The petals are also long. The insect-like labellum has a "head" about one-third long as the "body" and has a pair of dark projections near its base .

Its flower is also similar to those of other hammer orchids in that the labellum resembles a flightless female thynnid wasp however it can be distinguished by colouration of the labellum. The "head" and part of the "abdomen" of the insect-like labellum are light green with darker spots while the end of the "abdomen" is a dark maroon colour. The sepal at the back of the flower, the two at the sides and the petals are all long. The head-like top of the labellum is distinctly hairy and has two dark-coloured lumps at its base.

The insect-like labellum has a "head" about one- third long as the "body" and has a pair of dark projections near its base . The stalk of the labellum, joining it to the hinge, is spotted. The part of the labellum representing the female "body" of the insect greenish- yellow at the top end, spotted with maroon and the lower end is dark maroon in colour and swollen as in Drakaea glyptodon. The "head" part of the labellum is about one-quarter the length of the "body" and may be glabrous or covered with long hairs.

The labellum is relatively large, compared to other caladenias, white with red stripes and has serrated or toothed edges. There are two rows of red or white calli along the centre line of the labellum. Flowering occurs from September to mid-October.

One lobe is long, about wide and tapered, the other thread-like and long. The labellum has three lobes. The side lobes are thread-like, long and the middle lobe is linear and long. The labellum spur turns downwards and is long.

The dorsal sepal is long, wide and the lateral sepals are fused to form a synsepalum long and wide below the labellum. The petals are oblong to egg-shaped, long and wide. The labellum is long, about wide and has three lobes.

The tepals of the species of section Sessilis are long and wide. The tepals of the section Unguiculatis are long and wide. The labellum is about long and wide. The labellum encloses the floral bud until its opening, thereby protecting immature floral parts.

The rest of the labellum (representing the female "body" of the insect) is dark maroon in colour, has scattered hairs and the tip of the "abdomen" is in line with the rest of the labellum. Flowers appear from September to late November.

The labellum is oblong, white or pink, long, about wide and turns upwards through about 90° near its middle. The edges of the labellum are wavy and there is a green or whitish callus in its centre. Flowering occurs in January and February.

The tip of the labellum is curled under and there are between four and six rows of pink or white calli along the mid-line of the labellum. Flowering occurs from September to October but is more prolific after fire the previous summer.

The lateral sepals are long, wide and spreading. The petals are long and wide and arranged like the lateral sepals. The labellum is long, wide and white with purple lines and blotches. The tip of the labellum is orange and curled under.

The labellum is about long with three fringed lobes. Flowering occurs between February and July.

The labellum is heart-shaped, long, wide and reddish to cream-coloured with a reddish-black tip. It is divided into three lobes with 7 to 9 pairs of narrow linear teeth about long on the lateral lobes. The middle lobe of the labellum is strongly curved downwards and has many short teeth on its edges. There are four to six irregular rows of dark red calli in the centre of the labellum.

The lateral sepals are 12–30 mm long, about 1 mm wide and curve downwards. The petals are 20–22 mm long, about 1 mm wide and arranged like the lateral sepals. The labellum is 12–13 mm long, 8–10 mm wide and cream-coloured with wide red lines. The tip of the labellum is red, curls downward and there are two rows of club-shaped calli along the labellum mid-line.

The lateral lobes of the labellum are erect and surround the column while the central part has four to six short, purplish-black teeth on each side. The tip of the labellum is curved downward and there are four rows of dark purple, stalked calli along the mid-line of the labellum. Flowering occurs from October to November but only last for one or two days and the flowers are sometimes self-pollinating.

The middle part of the labellum has the longest teeth on its edge, the teeth red with hooked white tips. The front part of the labellum curves downwards, with the teeth becoming shorter. There are between four and eight rows of calli along the central part of the labellum, the calli pale to dark red and club-shaped, up to tall. The fruit is a non-fleshy, dehiscent capsule containing a large number of seeds.

The lateral sepals and petals are about the same size as the dorsal sepal and turn obliquely downward and form a crucifix-like shape. The labellum is long, wide and greenish-yellow with a small red tip which curls under. The sides of the labellum are smooth, lacking teeth but there is a dense band of dark reddish-purple, calli up to long, in the middle of the labellum. Flowering occurs from August to October.

The lateral sepals are long and wide, spread apart and curve downwards. The petals are long and wide and arranged like the lateral sepals. The labellum is long, wide and white to cream-coloured with narrow red teeth up to long on the sides. The tip of the labellum is curled under and there are four rows of white and red calli up to long, along the mid-line of the labellum.

The labellum is red, egg-shaped with the narrower end towards the base, about long, wide, with irregular edges and a pointed tip. There is a callus in the centre of the labellum and extending nearly to its tip. Flowering occurs from January to March.

There are 7 to 10 pairs of calli along the edge of the labellum, decreasing in length towards its front. There are six rows of foot-shaped calli in the centre of the labellum, also smaller towards the tip. Flowering occurs in September and October.

The labellum is oblong to egg-shaped with the narrower end towards the base, about long and wide and fleshy. There is a broad, tapering callus in the centre of the labellum and extending nearly to its tip. Flowering occurs from January to May.

The sepals are egg- shaped, long and wide. The petals are a similar shape, long and wide. The labellum has three widely spreading lobes long and wide with the middle lobe further divided into two. The spur behind the labellum is long and curved.

The labellum is long, wide, white with a purple tip and with a furrow along its mid-line. At the base of the labellum there is a purple, cylinder- shaped appendage with two yellow, fleshy lobes on top. Flowering occurs from August to November.

The labellum is egg-shaped, very pale pink, long, about wide and curves gently upwards then the tip curves forwards. There is a green, channelled callus in the centre of the labellum. Flowering occurs in late September and October but the flowers are short-lived.

The labellum is hinged to the base of the column and has three relatively small lobes.

The labellum is red, curved and projects above the sinus. Flowering occurs from March to October.

The tepals are strongly recurved and the three-lobed labellum has a line of white hairs.

The labellum is about long and wide with obscure lobes. Flowering occurs between September and November.

The labellum has three lobes and a backward-pointing spur with a hairy, finger- like callus.

The specific epithet (deformis) is a Latin word meaning "misshapen", again referring to the unusual labellum.

The side lobes of the labellum are erect and the middle lobe is often spatula-shaped.

This greenhood is pollinated by a particular species of fungus gnat, attracted by a kairomone produced by the flower's labellum. The labellum tips the insect into the flower, and in attempting to escape, it comes into contact with the sexual organs of the flower and pollination occurs.

The lateral sepals and petals have about the same dimensions as the dorsal sepal. The labellum is long, wide, purple and blue and curves downward near its tip. There are many scattered small, bead-like calli covering the labellum. Flowering occurs from August to early November.

The outer staminodes are shorter than the labellum. The labellum is yellowish, with a yellow ribbon in its center and it is obovate, with a length from . Three carpels are under a constant, trilobed ovary adherent, which is sparsely hairy. The fruit capsule opens with three compartments.

The petals are long and wide. The labellum is white, long, wide with narrow teeth, shorter than those in other subspecies, along its edges. There are four or more rows of pale red calli in the centre of the labellum. Flowering occurs from September to October.

The lateral sepals are thread-like, about long and long and the petals are similar but shorter. The labellum is tube shaped at its base and for about half its length before opening into a broad heart-shaped dish long and wide. This part of the labellum has a whitish centre and is covered with tiny bristles. The edges of the labellum have tiny teeth and there is a small tail-like tip on the lower edge.

The petals are lance-shaped, long, about wide and pressed against the sides of the ovary. The labellum is held horizontally, long and wide. Most of the upper surface of the labellum is covered with a callus of prominent, club-shaped, stalked glands, the one nearest the base of the labellum about long and shaped like a tiny duck's head. The column is green with red spots on the front, long, about wide with broad wings.

The lateral sepals and two petals usually spread obliquely downwards and sideways. The dorsal sepal and petals are attached to the base of the column where it joins to the ovary. As is usual in orchids, one petal is highly modified as the central labellum. Duck orchids have an unusual, insect-like labellum which is attached to the rest of the flower by a sensitive stalk which holds the labellum above the flower in the "set" position.

The labellum of P. mutica is attractive to a species of gnat which lands on the labellum and grasps the dark green appendage. When it does so, the labellum springs upward, trapping the insect inside the now- closed flower. The gnat can now only escape by pushing between "wings" on the sides of the column. As it does so, it either removes a pollinium or deposits one from a previously-visited flower of the same species, and pollination occurs.

The central vein extends about beyond the end of the labellum. The lateral sepals are long, about wide, linear to lance-shaped, often have a curved tip, are similar in colour to the dorsal sepal and project forwards below the labellum. The petals are a similar colour and are about long, narrow egg-shaped to lance-shaped and usually spread widely. The labellum is pink to pinkish-mauve, wide, about wide, with the edges not rolled and lacking teeth.

There is a glandular tip about long on the end of the dorsal sepal and about long on the lateral sepals. The petals are egg-shaped to lance-shaped, long, wide, spread apart from each other and curve upwards and inwards towards the labellum. The labellum is broadly heart-shaped, long and wide. There is a large, black, column-like callus up to long, surrounded by between one and four pairs of smaller calli on the labellum.

The lateral sepals are linear to lance-shaped, long, about wide and spread widely apart from each other. The petals are narrow egg- shaped, about long and wide and also have hairs on their edges. The labellum is egg-shaped with the narrower end towards its base, long, about wide with short hairs on its edges. There is an oblong callus in the centre of the labellum and extending three-quarters of the length of the labellum.

The lateral sepals are a similar size and shape to the dorsal sepal but spread widely and stiffly. The petals are long and about wide and droop slightly. The labellum is egg-shaped to heart-shaped, about long and wide and is sometimes all red, or dark maroon with a white base. The tip of the labellum curls under and there are between eight and ten red teeth up to long on each side of the labellum.

The lateral sepals are long and wide and spreading. The petals are slightly shorter and narrower than the lateral sepals and taper to narrow, thread-like tips. The labellum is red or yellowish-green with red markings and is long and wide. The sides of the labellum sometimes have teeth up to long and there are four or six rows of calli which are long near the base of the labellum but decreasing in size towards its tip.

The petals are narrow lance-shaped, long, about wide, taper to a thin tip and spread widely. The labellum is long and wide, cream- coloured with dark red stripes and blotches, and the tip is dark red and turned under. The sides of the labellum have a few short, blunt teeth and there are four rows of dark red, hockey stick-shaped calli up to long, along the centre of the labellum. Flowering occurs from November to January.

The dorsal sepal is erect, long and wide. The lateral sepals and petals have about the same dimensions as the dorsal sepal but they are held horizontally near their bases, then turn downwards and droop. The labellum is long, wide and cream-coloured with red lines and marks. The sides of the labellum have short, blunt teeth, the tip is curled under and there are two rows of anvil-shaped calli along the mid-line of the labellum.

The labellum is egg-shaped to lance-shaped, long and wide and curves downward at the tip. It is dark red with a whitish base and the sides of the labellum turn upwards. There is a fringe of linear teeth about long on the sides but which decrease in size towards the front. There are four to six rows of linear foot-shaped calli along the centre of the labellum, decreasing in size towards the front.

The sides of the labellum bear long, green, comb-like teeth. Flowering occurs between August and November.

The labellum is yellow, thick and fleshy, about long and wide. Flowering occurs between October and December.

There is a complex callus in the centre of the labellum. Flowering occurs from April to June.

The labellum is thick and has a more or less rough, irregular margin and a raised callus.

The labellum is dark purplish red, linear to elliptic in shape, about long, wide with purplish hairs up to on its edges. There is a thick, fleshy, dark purplish black callus in the centre of the labellum and extending almost to its tip. Flowering occurs from November to January.

The edges of the labellum have many teeth up to long and there are 4 to 6 rows of dark red calli along the labellum mid-line, decreasing in size towards the front. Flowering occurs between September and November and is strongly enhanced by fires the previous summer.

The sides of the labellum have many reddish teeth up to long and the tip is curled under. There are four or six rows of reddish calli up to long in the centre of the labellum. Flowering occurs from September to November and is more prolific after fire.

The dorsal sepal is erect, long and wide. The lateral sepals and petals have about the same dimensions as the dorsal sepal. The labellum is relatively flat, long, wide, bluish and white with the tip turned downwards. There are many rows of small, bead-like calli covering the labellum.

The ear-like petals are erect with a stalk long and a blade long and wide. The labellum has three lobes, the lateral ones long and wide. The middle lobe is wedge-shaped, long and wide. There is a single yellow ridge in the mid-line of the labellum.

The petals are long, about wide and curved. The labellum is dark purplish, long, wide, tapers to a point and turns sharply upwards near its middle. There is a blackish callus in the centre of the labellum and extending nearly to its tip. Flowering occurs in October and November.

The labellum is oblong to broad lance-shaped, long, about wide and dark reddish-brown with the tip rolled under. There are many short teeth along the sides of the labellum and four rows of calli along its centre on the flatter part. Flowering occurs from October to November.

The dorsal sepal is erect and the labellum is mostly white, long and with narrow teeth up to long on its sides. There are four or more rows of small, pale red calli up to long in the centre of the labellum. Flowering occurs from September to October.

The labellum is green to apricot-coloured, has a red tip and smooth edges. There is a dense band of tall calli along the centre of the labellum. Flowering occurs between August and October and is followed by a non-fleshy, dehiscent capsule containing a large number of seeds.

The lateral sepals are long and wide and spread apart. The petals are long, about wide and spread widely. The labellum is white, often with red marks and is long and wide. The sides of the labellum turn upwards and have stalked teeth and the tip is curled under.

The petals are also long. The insect-like labellum has a head about half as long as the body and its stalk, measured from the hinge is long. Unlike some other hammer orchids, the labellum is all the same dark maroon colour. Flowers appear in August and September.

The sides of the labellum turn upwards and have three or four pairs of thin green teeth up to long, and the tip curves downwards. There are four or six rows of dark red calli up to long, along the labellum mid-line. Flowering occurs from September to October.

The margins of the labellum lobes are slightly wavy but lack the teeth common in many caladenias. The lateral lobes are firmly wrapped around the column. There are two rows of short, yellowish calli in the central part of the labellum. The column is greenish with dark red bands.

The sepals and petals are pinkish with red markings and end in a club-like, dark reddish-brown gland. The labellum is long, wide when flattened, white to reddish with a deep red tip which curves downwards. The sides of the labellum curve upwards and have 5 to 7 purplish teeth up to long on each side and the middle part has blunt white teeth near its tip. There are four or six rows of calli along the centre of the labellum.

The lateral sepals are broadly elliptic in shape and spread apart from each other, turning slightly downwards. The petals are also elliptic in shape but often sickle-shaped and have a pointed tip. The labellum is pale pink, white near its edges and has dark red bars. The sides of the labellum curve upwards, partly surrounding the column, the tip is yellow with notched edges and there are two rows of stalked calli with bright yellow heads along the centre of the labellum.

The lateral sepals are lance-shaped to egg-shaped near their bases, long, about wide and taper to narrow glandular tips long. The petals are long, about wide and taper to a thin, pointed tip. The labellum is egg-shaped, long, wide and has four to eight pairs of triangular, dark purplish-red teeth on the edges. The tip of the labellum curls downward and there are four rows of calli up to long along the mid-line of the labellum.

The central vein extends about beyond the end of the labellum. The lateral sepals are long, about wide, linear to lance-shaped, pinkish with a red stripe down the centre and usually cross each other below the labellum. The petals are a similar colour and are about long, narrow egg-shaped to lance-shaped and spread widely. The labellum is dark purplish-red to purplish-maroon, wide, wide, roughly heart-shaped when flattened, the edges curled under with irregular teeth.

The lateral sepals are a similar length to the dorsal sepal but slightly wider, curve downwards and are nearly parallel to each other. The petals are long and about wide curve downwards. The labellum has an elongated heart-shape, about long and wide and is green or yellowish green with a dark red tip. The tip of the labellum curls under and there are between six and seven thin green teeth up to long on each side of the labellum.

The lateral sepals are a similar size, linear to lance-shaped and joined to each other, although sometimes only in the lower half. The petals are linear to lance-shaped and long. The labellum is white, pink or brownish long and turns upwards through 90° near its middle. The edges of the erect part of the labellum are sometimes slightly wavy and there is a raised, greenish, tapering callus in the centre of the labellum and extending almost to its tip.

There is a greenish, raised callus in the centre of the labellum. Flowering occurs from December to February.

The specific epithet (quadrata) is a Latin word meaning "four-cornered", referring to the shape of the labellum.

There is a pyramid-shaped callus near the base of the labellum. Flowering occurs from November to February.

The labellum is about long and wide, just visible above the sinus. Flowering occurs from March to May.

The tiny lumps on its leaf along with the long flower that lacks a swollen labellum are diagnostic.

The labellum is cup shaped, about long and wide with three lobes. Flowering occurs between January and June.

The labellum is orange, about long and wide with a notched tip. Flowering occurs between December and August.

The labellum is about long and wide with its tip turned down. Flowering occurs from October to December.

The lateral sepals are long, wide with a humped base and spread widely apart from each other. The petals are long, wide and striped with hairy edges. The labellum is about long, wide with its tip curled upwards and long hairs on its edge. The labellum quivers in the slightest breeze.

The lateral sepals are lance-shaped, long, wide and free from each other. The petals are lance-shaped, long, about wide and slightly dished. The labellum is a slightly paler green, lance-shaped, long, wide. Unlike those of most other prasophyllums, the labellum is not ornamented and resembles the petals.

The lateral sepals are long, about wide with their tips rolled under. The petals are long, about wide and usually curve forwards. The labellum is oblong, long, wide with irregular edges and turns downward towards the ovary. There is a raised, dark green callus in the centre of the labellum.

The labellum is long and wide and cream to red with darker red markings. The sides of the labellum have white-tipped serrations, its tip is curved downwards and there are two rows of anvil-shaped calli up to long, along its centre. Flowering occurs from August to early October.

The lateral sepals are long, wide and turn down below the horizontal. The petals are long and wide and arranged like the lateral sepals. The labellum is long, wide greenish yellow with a red tip. The tip of the labellum is curled under with teeth up to long, along the edges.

The labellum is dark reddish-brown, curved and protrudes slightly above the sinus. Flowering occurs between November and January.

The labellum is white, about long and wide, fleshy and channeled but unlobed. Flowering occurs from December to February.

The labellum is long and about wide with two ridges on its midline. Flowering occurs between March and July.

There are two ridged calli long in the mid-line of the labellum. Flowering occurs from August to October.

The tip of the labellum has two lobes and a narrow base forming a shallow depression containing two calli.

The lateral sepals are linear to lance-shaped, about long, wide and spread apart from each other. The petals are lance-shaped to egg-shaped, about long and wide with a pointed tip. The labellum is lance-shaped, to narrow egg-shaped, about long, wide and vibrates in the slightest breeze. The sides of the labellum are lines with many coarse, spreading cilia and there is a narrow oblong callus in the centre of the labellum and extending about half way to its tip.

The labellum is egg-shaped to heart-shaped, erect near its base but curves forward, especially towards its end. There are ten to twelve white or purplish calli up to long along the edges of the labellum and six to eight rows of red or white golf-club shaped calli in the centre and extending almost to the tip of the labellum. The column is long and transparent with reddish stripes and other shapes as well as broad wings. Flowering occurs from September to October.

The petals and lateral sepals are broad, long and are white and glabrous on the front and pinkish red to maroon with glandular hairs on the back. The labellum is about long when flattened, white with dark red to purple spots and lines with a wavy margin, a few short teeth and a pointed tip. There are four well-spaced rows of calli on the surface of the labellum. The calli are club-shaped, yellow or whitish becoming darker and shorter towards the tip of the labellum.

The petals are long, about wide and otherwise similar to the sepals. The lateral sepals and petals spread widely, turn down slightly or droop. The labellum is long, wide and curves forward with its tip strongly curving downwards. There are between 7 and 14 pairs of dark purplish, linear teeth up to long on the sides of the labellum and four or six rows of calli along the mid-line of the labellum, the longest of which are about long and shaped like hockey sticks.

The dorsal sepal is egg-shaped to lance- shaped, long and the lateral sepals are similar length, linear to lance- shaped, free and more or less parallel to each other. The petals are linear to lance-shaped and long. The labellum is white, pink or mauve, long, curves sharply upwards near its middle and the upturned part has irregular edges. There is a raised, shiny dark green, channelled callus in the centre of the labellum and extending just past the bend of the labellum.

The dorsal sepal is erect, long and wide and the lateral sepals have similar dimensions but spread widely and curve stiffly downwards near the tips. The petals are long and wide and arranged like the lateral sepals. The labellum is long, wide and white but with narrow red teeth up to long on the sides. The tip of the labellum is curled under and there are between four and eight rows of red, cream or white calli along the mid-line of the labellum.

The lateral sepals and petals are a similar size to the dorsal sepal but narrower. The labellum is white, has three obscure lobes and is about long. The labellum has a grainy texture and its edges are crinkled. Flowering occurs from October to March or later but the flowers are self-pollinating.

The lateral sepals are long, wide, a curved lance-shape and are slightly spreading. The petals are long and wide and spread widely. The labellum is long, wide and dark pink with dark red bars. The sides of the labellum curve upwards and the tip turns downward and has a few short teeth.

Prasophyllum pyriforme, commonly known as the graceful leek orchid is a species of orchid species endemic to eastern Australia. It has a single tubular leaf and up to fifty greenish flowers with a pink or white labellum. As with others in the genus, the labellum is above the column rather than below it.

There is a glandular tip long on all three sepals. The petals are lance-shaped, long, about wide and turn downwards towards the ovary. The labellum is diamond-shaped, long and wide. There is a reddish black, insect-like callus covering about two-thirds of the middle of the base of the labellum.

The petals face forwards and the lateral sepals are erect and joined at their sides. The labellum is white and curves upwards with a frilly edge. In the centre of the labellum is a frilly, pinkish callus. Flowering occurs from June to September and is more prolific after fire the previous summer.

The lateral sepals are lance-shaped to egg-shaped, long, about wide and spread apart. The petals are lance-shaped, about long, wide and curved. The labellum is more or less oval, long, wide with slightly wavy or toothed edges. There are two raised, dark green calli in the centre of the labellum.

The dorsal sepal is erect, long and wide. The lateral sepals and petals are long and wide. The labellum is about long, wide and whitish with the tip curved upward. At the base of the labellum there are two erect, fleshy calli about high with yellow bases and black or dark purple tips.

The lateral sepals have about the same dimensions as the dorsal sepal and the petals are slightly shorter and narrower. The labellum is long, wide, white with bluish- mauve stripes and a down-turned tip. There are many small, scattered, bead- like calli covering the labellum. Flowering occurs from September to November.

There are 6 to 14 creamy-white or pale pink, narrow anvil-shaped calli in two rows in the centre of the labellum for at least half of its length. Flowering occurs from July to late September. This species is similar to Caladenia polychroma but its flowers, especially its labellum is smaller.

The petals are purple with white edges and are long, wide. The labellum is white, long, wide, and turns sharply upwards through more than 90° near its middle. There is a yellowish green callus in the centre of the labellum and extending just past the bend. Flowering occurs from January to March.

The upturned part is wavy or crinkled with hair-like papillae on the edges. There is a raised, oblong to egg-shaped, shiny callus which is darker than the labellum and which is in the centre of the labellum and extending almost to its tip. Flowering occurs in late September and October.

The sepals and petals taper to thin, thread-like tips. The sepals have dark reddish, club-like, glandular tips long. The labellum is greenish-cream with pale reddish stripes and is long and wide. The sides of the labellum have short triangular teeth up to long, decreasing in size towards the tip.

Garay and Taylor noted that this species is almost identical to O. alismatophylla in vegetative morphology, but the two differ in the shape of the labellum on the flower. The labellum is fiddle-shaped and has three thickened veins in front of the calli.Garay, L.A., and P. Taylor. 1976. The genus Oeceoclades Lindl.

The labellum is white, long, wide and white with erect or spreading teeth up to long. The tip of the labellum is curled under and there are for to eight rows of white to reddish calli up to in its centre. The column is long and wide. Flowering occurs from August to October.

The petals are linear to lance- shaped and long and spread widely apart. The labellum is white or pink, long, turns upwards through 90° near its middle and has a slightly wavy edge. There is a broad, raised, tapering, greenish callus in the centre of the labellum. Flowering occurs from November to December.

There are four or more rows of pale red calli up to long in the centre of the labellum. Flowering occurs from November to early December. This subspecies is most similar to subspecies redacta and their distributions sometimes overlap but has larger flowers with a larger labellum and a later flowering period.

The lateral sepals are long, wide and spread forward and downward. The petals are long and wide and spread upwards. The labellum is long and wide and yellowish with deep purplish-red lines. The edges of the labellum are curled under and have small, crowded, blunt teeth and the tip is curled under.

The labellum is heart-shaped, long, wide and has three lobes. It is dark, yellowish-green with a dark maroon tip and the edges have irregular teeth. There are six crowded rows of calli along the centre of the labellum, decreasing in size towards the front. Flowering occurs from August to September.

There is a dense cluster of purplish-red calli in centre of the labellum. Flowering occurs from July to September.

The labellum spur is white and green, about long and parallel to the ovary. Flowering occurs between January and April.

The labellum is triangular, about long with a thin appendage and a rounded spur. Flowering occurs from July to October.

The labellum is about long and is not visible from outside the intact flower. Flowering occurs from January to April.

The petals are about long and less than wide. The labellum is about long and long and has three lobes.

The labellum is long, wide, fleshy and curved with a groove along its midline. Flowering occurs from April to September.

There are two ridged calli long in the mid-line of the labellum. Flowering occurs from July to early September.

There are two ridge-like calli about in the mid-line of the labellum. Flowering occurs in August and September.

The labellum is cream-coloured with pale purple markings and is long and wide. Flowering occurs in September and October.

The labellum has a furry upper surface and is curved, protruding above the sinus. Flowering occurs between October and February.

There are two raised, fleshy calli long in the mid-line of the labellum. Flowering occurs from August to October.

The labellum is hairy, broadly egg-shaped, long, about wide with a deep pouch. Flowering occurs from June to August.

The labellum is relatively wide and has crinkled edges and closely surrounds the column. The fruit are long, thin capsules.

There are two thick callus ridges long near the mid-line of the labellum. Flowering occurs in September and October.

There are two thick callus ridges long near the mid-line of the labellum. Flowering occurs in October and November.

There are two callus ridges about long near the mid-line of the labellum. Flowering occurs from September to November.

There are two raised callus ridges long near the mid-line of the labellum. Flowering occurs from October to December.

The labellum is whitish, about long, wide and turns sharply upwards through about 90° near its middle. There is a fleshy green, channelled callus in the centre of the labellum and extending past the bend. The callus is covered with small papillae. Flowering occurs in October and November but only after fires the previous summer.

The lateral sepals are long, wide and turn downwards with drooping tips. The petals are long and wide and arranged like the lateral sepals. The labellum is long, wide and cream-coloured with radiating red lines, spots and blotches. The sides of the labellum have short, blunt teeth, and the tip is curled under.

The lateral sepals are linear, about long, wide, pressed against the ovary and hidden below the labellum. The petals are lance-shaped to egg-shaped, long, about wide and spread apart below the dorsal sepal. The labellum is more or less round, shallow cup-shaped, fleshy, long and wide. Flowering occurs from September to December.

The lateral sepals are long, about wide and are partly joined to each other. The petals are long and about wide and spread widely. The labellum is white or pink with red bars and is long and wide. The sides of the labellum sometimes have a few short teeth near the tip which curls under.

The lateral sepals are long, wide and stiffly spread widely apart. The petals are long and about wide and are arranged like the lateral sepals. The labellum is white with pale pink stripes and is about long and wide. The sides of the labellum sometimes have a few short teeth and the tip curls under.

The labellum is greenish-yellow with a red tip and its sides have long, narrow teeth or "calli". There are four or more rows of red calli along the centre of the labellum. Flowering occurs between October and early December and is followed by a non-fleshy, dehiscent capsule containing a large number of seeds.

The petals are long, wide and arranged like the lateral sepals. The labellum is pale yellowish-white with red stripes, long, wide with forward-facing serrations on the sides. The tip of the labellum curves downwards and there are two rows of anvil-shaped calli along its centre. Flowering occurs from late July to September.

The lateral sepals are long, wide and spreading with drooping ends. The petals are long and wide and arranged like the lateral sepals. The labellum is long, wide and dark reddish- purple. The tip of the labellum is curled under and the sides are turned up and have many purplish teeth up to long.

The petals and sepals are white but some parts of the labellum are rose pink, purplish and green. The labellum has three lobes. The side lobe are erect, relatively small and pink or purple and the middle lobe has four or five greenish or yellowish ridges along its midline. Flowering occurs from December to January.

The lateral sepals and petals are 15–20 mm long, about 2 mm wide and horizontal near their bases, then curve downwards. The labellum is 6–8 mm long, 3–4 mm wide and yellowish green with a red tip. The sides of the labellum have narrow red or cream- coloured teeth up to 3 mm long, the tip of the labellum curls downward and there are four rows of dark red calli up to 1 mm long, along the mid-line. Flowering occurs from August to September.

The lateral sepals are lance-shaped to egg-shaped near their bases, long, wide and gradually taper to a reddish glandular tip. The petals are long, wide, narrow lance-shaped near the base then gradually taper to a thin glandular tip. The labellum is egg-shaped to lance-shaped, long, wide and has up to eight pairs of red, linear teeth up to long on the edges. The tip of the labellum curls downward and there are four rows of red, mostly linear calli along the mid-line of the labellum.

The lateral sepals are lance-shaped near their bases, long, wide and taper to narrow glandular tips slightly shorter than that on the dorsal sepal. The petals are long, wide, lance-shaped near the base then taper to a thin, sometimes glandular tip. The labellum is lance-shaped to egg-shaped, long, wide and has seven to ten pairs of linear teeth up to long on the edges. The tip of the labellum curls downward and there are four or six rows of dark red, mostly stalked calli along the mid-line of the labellum.

The lateral sepals are 35–50 mm long and about 4 mm wide and curve stiffly downwards. The petals are 35–45 mm long, 2–3 mm wide and curve downwards. The labellum is cream-coloured to white, 12–15 mm long, 9–11 mm wide with red markings. The sides of the labellum have reddish teeth up to 2 mm long, the tip of the labellum is curved downwards and there are four or six rows of reddish calli up to about 1 mm long, along its mid-line.

Caleana labellum has a single smooth, dull green or dull red leaf, long, wide and usually withered by flowering time. Usually only one greenish-yellow and red flower, long and wide is borne on a thin, wiry stalk high. The dorsal sepal, lateral sepals and petals are narrow and hang downwards with the dorsal sepal pressed against the column which has broad wings, forming a bucket-like shape. About one fifth of the outer part of the labellum is covered with glossy black glands or calli and the labellum flattened.

The tips of the sepals usually have black, glandular, club-like tips but these are lacking on the petals. The sepals and petals spread widely or droop and the dorsal sepal is erect and curves forward, forming a hood over the labellum. The labellum is egg-shaped to heart-shaped, long and wide, whitish to greenish with a dark red central portion, and curves forward. Teeth are mostly lacking on the sides of the labellum but there are four to six rows of golf club-shaped calli near its central part.

The labellum is greenish-brown, darker near the tip, curved and protrudes above the sinus. Flowering occurs between September and January.

The labellum is long and about wide, curved, reddish-brown and protrudes above the sinus. Flowering occurs between October and January.

There are two dark yellow, pimply callus ridges near the mid- line of the labellum. Flowering occurs in September and October.

There are two whitish spurs about long turning downwards from the base of the labellum. Flowering occurs from June to August.

There are four rows of deep red calli along the mid-line of the labellum. Flowering occurs from September to October.

There is a single raised, ridge-like callus along the mid-line of the labellum. Flowering occurs in July and August.

There are two ridge-like calli in the centre of the labellum near its base. Flowering occurs in September and October.

There are two callus ridges about long near the mid-line of the labellum. Flowering has only been observed in November.

Their color is purple-red or pinkish, with veins of darker color. The internal lateral tepals are brownish-purple and almost entirely hidden by the helmet. The labellum is brick red, trilobed and larger than the other tepals. The basal portion (hypochile) of the labellum is concave and enclosed in the helmet, with two raised and hairy lateral lobes.

The lateral sepals are long, about wide and spread widely and horizontally near their bases, then turn upwards. The petals are long, about wide and also spread upwards. The labellum is long, wide and red or yellow and red with dark red lines. The sides of the labellum lack teeth and the tip is rolled under.

The petals are oblong, long, wide and turned downwards near the sides of the ovary. The labellum is spade-shaped, held horizontally, long and wide. About one-third of the base of the labellum is covered with a black, ant-like callus about long. The column has prominent reddish striations and is long, about wide with broad wings.

Chiloglottis sphaerula is a species of orchid endemic to a small part of New South Wales. It has two dark green leaves and a single green to reddish pink flower with a shiny black insect-like callus covering two-thirds of the base of the labellum but with the tip of the labellum free of callus.

Chiloglottis seminuda, commonly known as the turtle orchid, is a species of orchid endemic to south-eastern New South Wales. It has two broad leaves and a single green or reddish pink flower with a shiny black insect-like callus covering two-thirds of the base of the labellum but with the tip of the labellum free of callus.

The lateral sepals are long, about wide and horizontal near their bases, then turn downwards and finally drooping. The petals are long, about wide and arranged like the lateral sepals. The labellum is long, wide and creamy-white with red lines or spots. The sides of the labellum have short, blunt teeth, and the tip is curled under.

Each flower has a thread-like pedicel long. The dorsal sepal is linear to oblong, long, about wide and the lateral sepals are fused to form a boat shape long, about wide below the labellum. The petals are linear to egg-shaped with similar dimensions to the lateral sepals. The labellum is long, about wide and has three lobes.

The lateral sepals are long, wide and are parallel to each other and held below horizontal. The petals are long, about wide and also turned slightly downwards. The labellum is long and wide and greenish-white with a dark red tip. The sides of the labellum turn upwards and have between four and six teeth up to long.

The lateral sepals are long, about wide, curve downwards and are parallel to each other. The petals are long and about wide and curve downwards. The labellum is long and wide, red or sometimes pale green and vibrates in the slightest breeze. The sides of the labellum curve downwards and have many spreading teeth up to long.

The petals are long and wide. The labellum is flat, long, wide, with short, purplish calli near its base. The middle section of the labellum has coarse, mauve, purple or bronze-coloured hairs up to and the tip has a glandular "tail" long and about wide. The column has two purple sham "eyes" joined by a distinct ridge.

The flowers are wide with pale yellow sepals and petals and a golden yellow labellum. The sepals are lance-shaped to egg-shaped, long and wide. The petals are almost round, long and wide with irregular edges on the outer half. The labellum is more or less square to round, long and wide with a partly woolly surface.

The dorsal sepal is erect, long and wide. The lateral sepals have similar dimensions to the dorsal sepal and the petals are long and wide. The labellum is membranous, long, about wide and whitish with its tip twisted into an S-shape. At the base of the labellum there are two fleshy, dark purple, club-shaped parallel calli long.

The lateral sepals are linear to oblong, long, about wide with their tips rolled under. The petals are a curved lance shape, long, about wide and spread widely apart. The labellum is more or less oblong, long, wide with notched edges and a narrowed middle section. There are dark green calli in the centre of the labellum.

The lateral sepals are green, about long, wide, joined at their bases and taper to a fine tip. The petals are about long, wide and taper to a thread-like tip. The labellum is longer than the dorsal sepal, long, wide with a greenish mound in the centre. The edges of the labellum have a few short, blunt teeth.

The labellum is flat, oval, about long wide with two round calli at the base and two parallel longitudinal ridges. The column is shorter than the labellum and has two wings widening towards the tip. Flowering occurs from June to October. This species is very similar to C. oblonga and "the status of these two species requires further investigation".

The petals and lateral sepals spread fan-like and the labellum has three distinct lobes. The lateral lobes lack teeth but the middle lobe has a dark pink tip and between four and ten short teeth on the sides. There are two rows of thick calli along the centre of the labellum. Flowering occurs from July to August.

The lateral sepals are about long, wide and are held behind the side lobes of the labellum. The petals are about long, wide and curve upwards beside the dorsal sepal. The labellum has three lobes, the side lobes are about long, long and curve upwards. The middle lobe is about long and curves downwards towards the ovary.

The petals are long, wide and spread widely, usually curving gently upwards. The labellum is creamy yellow with red stripes, long, wide with serrations on the sides. The tip of the labellum curves downwards and there are two rows of anvil-shaped calli up to long along its centre. Flowering occurs from late July to early September.

The lateral sepals spread widely or droop slightly. The petals are long and wide and arranged like the lateral sepals. The labellum is long and wide, white with red stripes, spots and blotches and the tip is curled under. The sides of the labellum have short, white-tipped teeth and there are two rows of calli in the centre.

Orchids in the genus Drymoanthus are small, unbranched, epiphytic herbs with thick roots, a thin stem, narrow, crowded, thin, leathery leaves and small, short-lived green flowers with a white labellum. The sepals and petals are similar to each other although the petals are slightly shorter. The labellum is white, boat-shaped, unlobed and stiffly attached to the column.

The labellum is long and wide when flattened and has three lobes. The mid-lobe is oblong to lance-shaped and completely covered by two closely spaced rows of shiny, dark crimson to black calli. The lateral lobes of the labellum are sickle-shaped, pink and erect or slightly spreading. Flowering occurs from October to January.

There is a callus in the centre of the labellum and extending nearly to its tip. Flowering occurs from December to April.

There is a callus in the centre of the labellum and extending nearly to its tip. Flowering occurs from November to January.

There is a callus in the centre of the labellum and extending nearly to its tip. Flowering occurs from February to April.

There is a callus in the centre of the labellum and extending almost to its tip. Flowering occurs between January and April.

There is a callus in the centre of the labellum and extending nearly to its tip. Flowering occurs between October and December.

The labellum is long, wide, brown, twisted to one side and just visible above the sinus. Flowering occurs from July to October.

There is a callus in the centre of the labellum and extending nearly to its tip. Flowering occurs from December to February.

There are two rows of yellow calli up to long in the centre of the labellum. Flowering occurs from October to December.

The labellum is not visible above the sinus between the lateral sepals. Flowering has been observed between mid November and early December.

There are two broad, pimply calli in the mid-line of the base of the labellum. Flowering occurs in August and September.

The petals are about long and wide. The labellum is purple, fleshy, about long and wide. Flowering occurs between May and November.

The labellum is long, about wide and brownish with a dark stripe along its mid-line. Flowering occurs from August to October.

The labellum is rigidly fixed to the base of the column and there is a deep sac- like structure at its base.

There are four or six rows of crowded calli in the mid-line of the labellum. Flowering occurs from August and October.

The labellum is boat-shaped, about long with a pointed appendage and a spur about long. Flowering occurs from August to September.

There are between two thick, ridge-like calli long in the mid-line of the labellum. Flowering occurs from August to October.

There are pimply callus ridges long at the base of the mid-line of the labellum. Flowering occurs from November to February.

The centre line of the labellum has four or more rows of red calli. Flowering occurs between late November and early February.

There is a linear to egg-shaped, shiny greenish callus in the centre of the labellum. Flowering occurs from June to early September.

The labellum is curved, has a reddish tip and extends above the sinus between the lateral sepals. Flowering occurs from September to December.

There is a tapered callus in the centre of the labellum and extending almost to its tip. Flowering occurs from February to April.

The labellum is long, about wide and pale green with a darker geen stripe along its centre. Flowering occurs from July to September.

The labellum is oblong, long, about wide, reddish or brownish and covered with short, stiff hairs. Flowering occurs from June to early August.

There are four rows of reddish-black calli up to long in the centre of the labellum. Flowering occurs in September and October.

There is an oblong callus in the centre of the labellum and extending nearly to its tip. Flowering occurs in November and December.

The labellum is about as long as the sepals, closely surrounds the column and has a tube-like base and two longitudinal ridges.

Referring to C. carnea var. gracillima, Rupp noted "the segments are narrow and acuminate" and "the labellum is ...narrower than in other forms".

There are two broad callus ridges long at the base of the mid-line of the labellum. Flowering occurs in November and December.

There are four or more rows of pale red calli along the centre line of the labellum. Flowering occurs in September or October.

The labellum is a broad egg shape, long and wide, folded lengthwise with the tip turned downwards. Flowering occurs from November to January.

There are two rows of anvil-shaped, cream-coloured calli along the mid-line of the labellum. Flowering occurs from October to November.

There are four crowded rows of calli up to long along the mid-line of the labellum. Flowering occurs from August to October.

The labellum is about long and wide with three lobes, the middle lobe about long and hairy. Flowering occurs from November to May.

There are four or six rows of red calli with white tips along the labellum mid-line. Flowering occurs from August to October.

The labellum is purplish, egg-shaped to lance-shaped, long and turns sharply upwards near its middle. Flowering occurs from September to January.

The column is almost as long as the labellum and curves forward with two wide wings. Flowering occurs from August to late September.

There is a glandular tip less than long on all three sepals. The petals are lance-shaped with the narrower end towards the base, about long, wide, slightly curved and turned down against the sides of the ovary. The labellum is shaped like a bricklayer's trowel with the narrower end towards the base. It is long, about wide and most of the upper surface of the labellum is covered with a callus of many short reddish, yellowish, bright green or black glands, the one nearest the base of the labellum about long and shaped like handlebars.

As is usual in orchids, one petal is highly modified as the central labellum. The labellum is longer than all the other parts of the flower, oblong near its base, triangular near the tip and densely covered with purple or metallic-coloured hairs, short near the base of the labellum increasing in length towards its tip. The sexual parts of the flower are fused to the column, which is short and broad with broad wings on its sides. The base of the column forms two rounded collars around the stigma, each often with an eye-like spot.

Isabelia have unifoliated ovoid to fusiform pseudobulbs, linear or acicular leaves, and erect apical inflorescence bearing one of few flowers. The flowers have petals, sepals and labellum of the same color, which can be white, pale pink or magenta. Their sepals are widely elliptical to ovate; the petals can be narrower and oblong or wider elliptic. The labellum is entire and oblong.

The sepals and petals are long and wide with the petals shorter than the sepals. The sepals and petals spread widely and horizontally or curve downwards. The labellum is greenish-cream with a dark red tip and is long and wide. The sides of the labellum curve upwards and have linear teeth up to long, decreasing in size towards the tip.

The lateral sepals are oblong to lance-shaped, long, wide and end in a gland similar to the one on the dorsal sepal. The petals are long, about wide and taper to a point. The labellum is a broad egg-shape, curves forward, long and wide when flattened. The labellum is cream-coloured at its base but red nearer the tip.

There is a glandular tip long on the end of the dorsal sepal and long on the lateral sepals. The petals are oblong, long, about wide and turned downwards near the ovary. The labellum is held horizontally, diamond-shaped, long and wide. The callus resembles a large black ant surrounded by thin, stalked glands and covers most of the labellum.

The lateral sepals are oblong to lance-shaped, long, wide and end in a gland similar to the one on the dorsal sepal. The petals are long, wide and taper to a point. The labellum is a broad egg-shape, curves forward, long and wide when flattened. The labellum is cream-coloured with red veins and a dark red tip, sometimes entirely red.

There is a glandular tip long on the end of the dorsal sepal and long on the lateral sepals. The petals are narrow oblong, long, about wide and turn downwards towards the ovary. The labellum is broadly spatula-shaped, long and wide. There is a shiny black, insect-like callus about long and wide near the base of the labellum.

The lateral sepals are long, about wide with their tips rolled under. The petals are lance-shaped but curved, about long, wide and are held under the dorsal sepal. The labellum curves downwards and is long, about wide with scalloped edges and a notch at the tip between two prominent lobes. There is an irregularly-shaped callus in the centre of the labellum.

Caleana brockmanii, commonly known as Brockman's duck orchid is a species of orchid endemic to the south-west of Western Australia. It has a single smooth leaf, a single greenish yellow and red flower and is distinguished by its flat labellum, relatively late flowering period and calli only near the tip of the labellum. It is found south from Perth.

Caleana dixonii, commonly known as the sandplain duck orchid is a rare species of orchid endemic to the south-west of Western Australia. It has a single smooth leaf and a single greenish yellow and fawn-coloured flower. It is distinguished by its flattened labellum with calli only near the tip of the labellum and its preference for growing on sandplains.

The lateral sepals are long, wide, spreading horizontally near their bases but then drooping. The petals are similar to the sepals but slightly shorter and narrower. The labellum is white, long, wide with erect to spreading teeth up to long along its sides. The middle part of the labellum has the longest teeth on its edge, the teeth red with hooked white tips.

Cryptostylis hunteriana is a terrestrial, perennial, deciduous, saprophytic herb. Up to ten flowers long and wide are borne on a flowering stem high. The most prominent feature of the flower is its spatula-shaped labellum which is red or maroon in colour with a green base, and is distinctly hairy. The labellum is long and wide with inrolled margins and a smooth underside.

The petals are 35–80 mm long and about 3 mm wide and arranged like the lateral sepals. The labellum is 14–22 mm long, 7–10 mm wide and projects forward with a white tip. The side of the labellum have short, thin, pale red teeth, its tip curves downward and there are four rows of pale red calli along its centre.

The lateral sepals are long and wide and turn downwards. The petals are long, wide and are sometimes spreading otherwise turn upwards. The labellum is long, wide and creamy-yellow with a dark red, down-curved tip. The sides of the labellum have linear teeth up to long and there are four or six rows of dark red calli along its mid-line.

The lateral sepals are long, wide, curve upwards, are closely parallel to each other, and have narrow club-like glandular tips. The petals are long and about wide and spread horizontally or curve downwards. The labellum is long and wide, greenish- yellow with a red tip which curls downwards. The labellum is delicately hinged so that it vibrates in the slightest breeze.

The pinkish flowers are arranged in a one-sided spike. The lip or labellum is 7–9 mm long and is deeply divided into three lobes, the middle lobe being the longest. The sepals and lateral petals are about 1 mm shorter than the labellum, and together form a "hood". A spur is present, about 6 mm long, slightly expanded at the tip.

The dorsal sepal is long and about wide and the lateral sepals are a similar size and fused to each other. The petals are long, wide and turn forwards. The labellum is long, about wide and turns sharply upwards near its middle, the upturned part with slightly wavy edges. A broad callus covers most of the labellum, reaching almost to its tip.

The sepals and petals are long and wide and slightly turned backwards. The labellum is long and mauve to maroon. There are two diverging linear, hairy keels near the base of the labellum and a band of mauve hairs about long along its midline. A form with sepals and petals that are completely dark maroon occurs in some parts of its distribution.

The dorsal sepal is egg-shaped, long, wide, forms a hood over the labellum and has three prominent, red veins. The central vein projects forward to a point long at the front of the flower. The lateral sepals are long, about wide, project forwards below the labellum, sometimes crossed, sometimes parallel. The petals are about long, about wide, lance-shaped and pointed.

The lateral sepals and the petals hang down against the ovary. The labellum is inclined upwards, is red- striped, has a smooth edge and a glandular tip. In the centre of the labellum is a band of deep purple-red calli. Flowering occurs between August and early November and is followed by a non-fleshy, dehiscent capsule containing a large number of seeds.

The lateral sepals are long, wide, turn stiffly downwards and roughly parallel to each other. The petals are long, wide, spread widely and are also turned stiffly downwards. The labellum is long, wide, broadly diamond-shaped and white to yellow with a deep red tip. The sides of the labellum have greenish teeth up to long and the tip is curled under.

The dorsal sepal is erect, the lateral sepals are wide and the petals are wide. The labellum is white, long with narrow teeth long and the column is and wide. The relatively narrow sepals and petals and the small labellum, together with the distribution of this subspecies, distinguish it from others in the same species. Flowering occurs from August to mid-September.

The dorsal sepal is erect, long, wide and the lateral sepals are long and wide, spread apart and curve stiffly downwards. The petals are long, wide and curve stiffly downwards. The labellum is long and wide, and greenish cream-coloured. The sides of the labellum turn upwards and have dark red, linear teeth up to long, and the tip curves downwards.

The sepal at the back of the flower is long and the two at the sides are . The petals are also long. The insect-like labellum has a "head" about one-third long as the "body" and which is mostly hairy. The rest of the labellum (representing the female "body" of the insect) is dark maroon in colour and glabrous.

The lateral sepals are about the same size as the dorsal sepal, held horizontally near their bases then turn downwards and droop. The petals are long, wide and arranged like the lateral sepals. The labellum is long, wide and creamy-white with pale red lines and spots. The sides of the labellum have short, blunt teeth and the tip is curled under.

The sepal at the back of the flower is long and the two at the sides are . The petals are also long. The insect-like labellum has a head about half as long as the body and is hairy for at least half its length. The "body" of the labellum is dark-coloured, slightly swollen and has a few hairs.

The labellum is egg-shaped, long, wide and pale yellowish with red streaks and a red tip which is curled under. The sides of the labellum have linear teeth up to long and there are four or six well-spaced rows of shiny red calli along its mid-line but not extending to the tip. Flowering occurs in September and October.

The petals are linear to lance-shaped, long, about wide and white with a dark central stripe. The labellum is oblong to egg-shaped, long, about wide, turns sharply upwards near its middle. The edges of the upturned part of the labellum are very ruffled and there is a thin, green, fleshy callus in its centre. Flowering occurs in August and September.

The lateral sepals are long and about wide and curve stiffly downwards. The petals are long, about wide and curve stiffly upwards. The labellum is long, wide and creamy white with red stripes. The sides of the labellum have up to six short teeth on each side and there are two rows of red, anvil-shaped calli along its mid-line.

It is cream-coloured with reddish lines. The sides of the labellum turn upwards and have reddish a fringe of linear teeth mostly long but decreasing in size towards the front. There are about four rows of foot-shaped calli along the centre of the labellum, decreasing in size towards the front. Flowering occurs between late August and early October.

The lateral sepals are linear to lance-shaped, wider than the dorsal sepal, spread widely and taper to a point. The petals are a similar shape to the sepals but narrower and about long. The labellum is brownish-red with a smooth edge and curves downward near the tip. There are densely crowded, tall, red-tipped calli in the centre of the labellum.

All species of Levenhookia possess a sensitive labellum that performs a similar function to the column of Stylidium species. The labellum responds to touch and enables the plants to promote cross-pollination and avoid self-pollination. Most species of Levenhookia are ephemeral plants that prefer sand heath habitat. Levenhookia species also possess glandular trichomes similar to those of its sister genus, Stylidium.

There is an oblong callus in the centre of the labellum and covering about half of its surface. Flowering occurs between December and February.

The labellum is long and wide and resembles the head of a duck on a strap-like "neck". Flowering occurs from September to January.

There is a broad, tapering callus in the centre of the labellum and extending nearly to its tip. Flowering occurs from January to April.

There are two thick, ridge-like calli long in the mid-line of the base of the labellum. Flowering occurs from July to September.

There are two rows of cream to pinkish, anvil-shaped calli along the centre of the labellum. Flowering occurs from August to mid-October.

There are four densely crowded rows of calli up to long along the mid-line of the labellum. Flowering occurs from August to October.

There are six rows of club-shaped, creamy yellow calli along the mid-line of the labellum. Flowering occurs in late August and September.

There are two ridge-like calli about long, surrounded by yellow in the mid- line of the labellum. Flowering occurs from September to December.

The sepals and petals are tapered and curve downwards. The labellum is long, wide with two orange calli. Flowering occurs between May and August.

The labellum is horseshoe-shaped, about long and wide with between six and eight teeth near its tip. Flowering occurs between January and May.

There is a fleshy, shiny callus in the centre of the labellum and extending almost to its tip. Flowering occurs from October to December.

There are two flattened callus ridges long near the mid-line of the labellum. Flowering occurs in October and November, more prolifically after fire.

There are four or six rows of well- spaced pink calli along the mid-line of the labellum. Flowering occurs in September to October.

There are six rows of reddish calli with cream- coloured tips along the labellum mid-line. Flowering occurs from late September to early November.

The labellum is pear-shaped, about long, wide with a blunt appendage and a spur on its end. Flowering occurs from August to September.

The labellum is about long and wide with three obscure lobes that often have teeth on the tip. Flowering occurs between February and June.

The lateral sepals are free from each other and the labellum curves strongly upwards between the lateral sepals. Flowering occurs from June to August.

There is a narrow egg-shaped callus in the centre of the labellum and extending almost to its tip. Flowering occurs in March and April.

There is a narrow lance-shaped callus in the centre of the labellum and extending almost to its tip. Flowering occurs between December and April.

There is a dark purplish-black callus in the centre of the labellum and extending almost to its tip. Flowering occurs from December to April.

There is a dark purplish-black callus in the centre of the labellum and extending almost to its tip. Flowering occurs in November and December.

There is a broad, fleshy, glossy callus along the centre of the labellum and extending nearly to its tip. Flowering occurs in October and November.

The labellum is 18–22 mm long, 5–6 mm wide, reddish brown and protrudes above the sinus. Flowering mainly occurs from July to November.

There is a dense band of dark red calli up to long in the centre of the labellum. Flowering occurs from September to early November.

The petals are long and about wide. The labellum is fleshy, curved in a semicircle, about long and wide. Flowering occurs from May to August.

The labellum is heart-shaped and has a prominent callus. The fruit is a thin- walled, glabrous capsule, containing a large number of winged seeds.

The labellum is pink to mauve and projects forwards, long, wide with a narrow central band of mauve hairs. Flowering occurs between October and February.

There are four or more rows of white to pale red calli along the centre line of the labellum. Flowering occurs in September or October.

The labellum is long and about wide, its tip divided into two lobes with broad teeth on the edges. Flowering occurs from August to October.

There are four or more rows of pale red calli up to long in the centre of the labellum. Flowering occurs from August to September.

The edges of the labellum are smooth and there is a broad, green to reddish callus in its centre. Flowering occurs in December and January.

There are four crowded rows of deep red calli up to long in the centre of the labellum. Flowering occurs from September to early November.

There are four or six rows of reddish-purple calli up to long in the centre of the labellum. Flowering occurs from September to October.

The labellum is green, about long and wide with three obscure lobes, the middle lobe with a notched tip. Flowering occurs between February and July.

The specific epithet ("ciliata") is from the Latin word meaning "eyelash" or "eyelid", referring to the long hairs found on the sides of the labellum.

All are covered with glandular hairs and have drooping tips. The labellum is long, about wide and egg-shaped when flattened. The labellum has many short, broad teeth along its edge and there are two rows of flattened calli in its centre. This species is similar to Caladenia filamentosa but is usually not as tall and the flowers not as red as those of that species.

This genus lacks the saccate base of the labellum, a typical characteristic which is present in the other genera in the subtribe Coelogyninae. The free lip has high lateral lobes along the basal part of the labellum (hypochile) and smooth, toothed or warty keels. The pseudobulbs of one internode vary in size. They may be closely or widely spaced through sympodial growth along the rhizome.

The lateral sepals are linear to lance-shaped, long, about wide, boat-shaped near the tip and spread widely apart. The petals are egg- shaped, pointed, about long and wide with hairless, sometimes notched edges. The labellum is narrow egg-shaped to lance-shaped, about long, wide with the edges rolled and hairless. There is a fleshy, raised, channelled callus in the centre of the labellum.

The lateral sepals are about long, wide, point downwards and spread widely apart from each other. The petals are about long, wide, with a sharply pointed tip and hairless edges. The labellum is purplish brown, oblong, about long, wide with a curled, sharply pointed tip and hairless edges. There is a callus in the centre of the labellum and extending almost to its tip.

The lateral sepals are long, wide with a humped base and spread widely apart from each other. The petals are long, wide with a pointed tip and hairy edges. The labellum is about long, wide and purplish with a pointed tip and red hairs on its edges. The labellum quivers in the slightest breeze and there is a small, club-shaped callus in its centre.

The labellum is egg-shaped to lance-shaped, about long, whitish-green with a pink or red curled tip. The labellum has a fringed edge and there are between four and six rows of red calli along its mid-line. Flowering occurs in August and September and is followed by an oblong-shaped capsule which releases hundreds of seeds in late October or November.

Garay, L.A., and P. Taylor. 1976. The genus Oeceoclades Lindl. Botanical Museum Leaflets, Harvard University 24(9): 249-274. Garay and Taylor noted that O. analamerensis is similar in vegetative morphology to O. alismatophylla, but it can be distinguished from similar species by its floral morphology, including the two small lamellae at the base of the labellum and the hairy disc on the labellum.

Memoria Mark Aldridge. The flowers somewhat resemble those of A. leonis. Additionally, the hybrid combines the traits controlling the flower's post-pollination changes. In the case of A. eburneum the flowers age such that the labellum curls inward with the sepals and lateral petals remaining mostly stationary whereas in the case of A. sesquipedale both the sepals and petals move except for the labellum.

There is a glandular tip about long on the sepals. The petals are lance-shaped but curved, long, wide and spread widely apart from each other. The labellum is broadly egg-shaped to heart-shaped, long and wide. About two-thirds of the upper surface of the labellum is covered by a callus with about twelve reddish, yellowish or bright green glands up to long.

The lateral sepals are long and wide and curve stiffly downwards. The petals are long, about wide and arranged like the lateral sepals. The labellum is long, wide and creamy-white with red lines and spots. The sides of the labellum have short, blunt teeth and there are two rows of anvil-shaped, cream-coloured calli which sometimes have red tips along its mid-line.

Inside the petals are structures formed from four sterile stamens (staminodes): two lateral staminodes form what appear to be small upright petals, about 1.2 cm long by 7 mm wide; two central staminodes are fused at the base to form a lip or labellum, 2.5–3.5 cm long by 2.5–3 cm wide. The labellum bends backwards and is deeply split into two lobes, each divided again.

There is a glandular tip long on the end of the dorsal sepal and about long on the lateral sepals. The petals are lance-shaped, long, about wide and spread apart from each other. The labellum is broadly heart-shaped, long and wide. There are about twelve erect, linear, reddish to blackish glands on a wrinkled callus long covering two-thirds of the labellum near its base.

The lateral sepals are long and wide and turn stiffly downwards but do not clasp the ovary. The petals are long, wide and arranged like the lateral sepals. The labellum is long, wide and greenish-cream with pale red lines. The sides of the labellum lack teeth but are rolled under and the tip has a thickened, red, V-shaped glandular tip and is curled under.

There is a glandular tip about long on all three sepals. The petals are narrow lance-shaped but curved, long, about wide, spread widely apart from each other and curve upwards. The labellum is egg-shaped to heart- shaped, long and wide. About half of the upper surface of the labellum is covered by a callus shiny black, column-like glands up to long.

The lateral sepals are oblong to lance-shaped, long, about wide and end in a gland similar to the one on the dorsal sepal. The petals are long and taper to a point. The labellum is heart- shaped, curves forward, long and wide when flattened. The labellum has three yellowish-green lobes, reddish in the central part, the middle lobe with about 7 pairs of broad teeth.

The labellum is long, wide and dark red or pale yellow with dark red edges and the tip curled under. The sides of the labellum have dark red, linear teeth up to long, decreasing in length towards the tip. There are four or six well-spaced rows of calli along its mid-line. Flowering occurs in August and September and is more prolific after summer bushfire.

The sides of the labellum are slightly wavy near its base and have teeth nearer the tip which is strongly curled under and pink. There are four rows of calli along the centre of the labellum. The column has broad, rounded wings and reddish blotches. Flowering is in October and November and is followed by oval-shaped, greenish or reddish capsules long and wide.

There are narrow teeth up to long with yellow tips on the sides of the labellum and four rows of white calli with yellow or purplish tips in the centre of the labellum. Flowering occurs from October to November. This orchid is similar to C. gracilis but can be distinguished by its very narrow leaf, different flower colour, smaller, more widely spaced calli and narrower column.

The lateral sepals are parallel and close together below the flower and are long, wide. They point downwards at their base but then curve upwards in front of the labellum. The petals are slightly shorter and narrower than the sepals and point downwards at an oblique angle. The labellum is loosely hinged to the column, long, wide, green to yellowish with a dark purple tip.

Pterostylis tasmanica, commonly known as the small bearded greenhood, is a species of orchid in the family Orchidaceae which is native to south-eastern Australia and New Zealand. It has a single green flower with translucent "windows" and a long, thin labellum bordered with golden hairs. It is similar to P. plumosa but is shorter, with smaller leaves and flowers but a more densely feathery labellum.

Caladenia, commonly known as spider orchids, is a genus of 350 species of plants in the orchid family, Orchidaceae. Spider orchids are terrestrial herbs with a single hairy leaf and a hairy stem. The labellum is fringed or toothed in most species and there are small projections called calli on the labellum. The flowers have adaptations to attract particular species of insects for pollination.

The petals are 35–80 mm long and about 3 mm wide and also curve downwards. The labellum is 14–22 mm long, 7–10 mm wide, cream-coloured and projects forward with a dark red tip. The side of the labellum have thin, red, erect teeth up to 2.5 mm long, its tip curves downward and there are four rows of red calli along its centre.

The petals are 35–80 mm long and about 3 mm wide and arranged like the lateral sepals. The labellum is 14–22 mm long, 7–10 mm wide, white, and projects forward, lacking a dark red tip. The sides of the labellum have thin, red or white, short erect teeth, its tip curves downward and there are four rows of calli along its centre.

The petals are 10–15 mm long, about 2 mm wide and spread horizontally or somewhat downwards. The labellum is 10–12 mm long, 8–12 mm wide, greenish with faint red lines and heart-shaped with a small, dark red, down-curved tip. There is a dense band of tall, red-tipped calli along the mid-line of the labellum. Flowering occurs from August to October.

The petals are held ear-like above the rest of the flower with the blade long and wide on a blackish stalk long. The labellum is long and has three lobes. The centre lobe is broadly egg-shaped, long and wide and the side lobes are long and wide. There are two parallel callus ridges long and edged with brown in the mid-line of the labellum.

The petals are erect or curved backwards with the blade long and wide on a brown stalk long. The labellum has three lobes, the centre lobe long and wide and the side lobes long and about wide. There are two callus ridges long in the mid-line of the labellum. Flowering occurs from October to November and is enhanced by a hot fire the previous summer.

Caladenia plicata was first formally described in 1882 by Robert D. FitzGerald and the description was published in The Gardeners' Chronicle. Fitzgerald noted that this is - "a very hairy species, about 1 foot high.........(The labellum is constantly moving up and down with the slightest breath of air.)" The specific epithet (plicata) is a Latin word meaning "fold" referring to the unusual shape of the labellum.

The lateral sepals spread apart below the flower and are long, wide. The petals also spread widely, are slightly shorter and narrower than the sepals and have their tips rolled inwards. The labellum resembles the body of a wingless female thynnid wasp and is stiffly hinged to the column. The labellum has a dummy insect abdomen, long, wide and curved with many maroon-coloured hairs and calli.

The petals are smaller than the sepals, thin and are spread below or under the dorsal sepal. As is usual in orchids, one petal is highly modified as the central labellum. The labellum is egg-shaped to oblong and hangs or is curved against the ovary. The sexual parts of the flower are fused to the column, which is shaped like half a cylinder.

The petals are a similar length to the lateral sepals but only about wide. The labellum is long, wide and cream-coloured at first, becoming apricot-coloured with purplish stripes as it ages. The side lobes of the labellum are erect and pointed and the middle lobe turns downwards with three ridges, the central ridge larger and wavy. Flowering occurs from August to September.

The lateral sepals are long and wide, curve downwards and are nearly parallel to each other. The petals are long, about wide and curve downwards. The labellum is long and wide and is green with a dark maroon tip. The tip of the labellum curls under and there are between two and four pairs of thin green teeth up to long on the sides.

The sepals and petals spread widely apart from each other with their tips turned outwards. The sepals are long, about wide and the petals are a slightly longer but narrower. The labellum is long, about wide, curved and yellow with purple markings. The labellum has three lobes, the side lobes erect and blunt and the middle lobe with wavy edges and three ridges along its midline.

It has dark streaks similar to those on the labellum. The lateral sepals are greenish, linear to lance-shaped, up to long and turn downwards and parallel to each other. The petals spread sideways or droop and are narrow egg-shaped to elliptic, up to long on a green, stalk-like "claw". The labellum is up to long, often has brownish streaks, and has three lobes.

The sides of the labellum are slightly wavy near its base and have teeth nearer the tip which is strongly curled under and pink. There are four rows of calli along the centre of the labellum. The column has broad, rounded wings and reddish blotches. Flowering is in October and November and is followed by oval-shaped, greenish or reddish capsules long and wide.

The petals are erect or turned backwards with an egg-shaped blade long and wide on a blackish stalk long. The labellum is long and has three lobes. The centre lobe is egg-shaped to wedge-shaped, long and wide and the side lobes are narrow oblong, long and wide. There are two purple, ridge-like calli extending from the base of the labellum to its midpoint.

The petals have a broad egg-shaped to almost circular blade on a dark coloured stalk. The labellum is long and has three lobes. The centre lobe is egg-shaped with the narrower end towards the base, long and the side lobes are oblong to wedge-shaped, long and wide. There are two ridge-like calli about in the mid-line of the labellum.

The petals are held horizontally, often turned backwards with an elliptic blade long and wide on a brown stalk long. The labellum is long and has three lobes. The centre lobe is egg-shaped, long and wide and the side lobes are long and less than wide. There are two ridge-shaped calli long at the base of the mid-line of the labellum.

The lateral lobes of the labellum are erect and surround the column while the central part has eight to ten short teeth on the sides. The tip of the labellum is curves slightly downwards and there are two rows of yellow to orange stalked calli along the mid-line. Flowering occurs from October to January but some flowers are self-pollinating and do not fully open.

The lateral sepals are lance-shaped but curved, long, about wide and turn downwards towards the ovary. The petals are linear, curved, about long, wide and turned backwards against the ovary. The labellum is about long and pale green with a dark purple base. There is an insect-like callus about long with dark reddish brown, hair-like glands in a central band on the labellum.

The dorsal sepal is mostly transparent grey with reddish purple streaks, long and wide. It is erect near its base then curves forward, protruding over the labellum. The lateral sepals and petals are linear, about long, wide and tapered. The labellum is longer than the dorsal sepal and forms a tube long near its base, before curving and flattening into a concave dish shape, long and wide.

The labellum is reddish with a serrated, purplish edge, long, wide and narrow oblong in shape. The callus is green, covers most of the labellum and has many pimply papillae near its end. The column is long and widest at its base. Flowering occurs between March and May and the capsule that follows is long, wide, oval shaped and has red lines on its ribs.

The labellum is greenish-white with red or brown markings and a red tip. There is a dense band of calli along the centre of the labellum. Flowering occurs between August and October and is followed by a non-fleshy, dehiscent capsule containing a large number of seeds. This orchid is similar to Caladenia doutchiae but has shorter sepal tips and a more southerly distribution.

The lateral sepals are long, wide and spread widely. The petals are long and wide and spread widely. The labellum is long and wide and white or yellowish with the tip rolled under and lacking a red tip. The sides of the labellum have thin teeth up to long and there are four rows of pale red calli up to long in the centre.

The lateral sepals are long, wide and turn stiffly downwards. The petals are long and wide and spread nearly horizontally. The labellum is long and wide and pinkish-white with the tip rolled under and lacking a red tip. The sides of the labellum have pinkish teeth up to long and four to six rows of pinkish to deep red calli up to long in the centre.

The lateral sepals are long and wide and the petals are long and about wide. The labellum is long and wide and yellowish-green to pinkish with a red tip, the end of which is turned downwards. The labellum has smooth edges and there is a dense band of purplish-red calli up to long in the centre. Flowering occurs from August to September.

The lateral sepals are long, wide and suddenly narrow at about half their length. The petals are long, about wide, linear to lance-shaped and turn obliquely downwards. The labellum is green with a dark red tip, and is long and wide. The sides of the labellum turn upwards and have three to five green teeth up to long and short red teeth on each side.

The petals are long and wide, spread slightly upwards near their bases, then drooping. The labellum is long and wide, cream-coloured to yellow with red or brownish stripes and the tip is curled under. The sides of the labellum have irregular serrations and two rows of broad, anvil-shaped, shiny cream-coloured calli in the centre. Flowering occurs from September to mid-October.

The petals are long and wide. The lateral sepals and petals spread widely near their bases but turn downwards nearer their tips. The labellum is long and wide and pink with a dark red tip which curls under. The sides of the labellum have thin teeth up to long and there are four rows of dark red calli up to long in the centre.

The dorsal sepal is erect, long and wide. The lateral sepals are long and wide, the petals are long and wide and all spread horizontally near their bases then turn slightly downwards. The labellum is white, long, wide with narrow teeth, up to long along its edges. There are usually two or four rows of pale red calli up to long in the centre of the labellum.

The petals are linear to lance-shaped, long, about wide and green with brown streaks. The labellum is broadly egg-shaped, long, about wide and turns sharply upwards near its middle, often reaching between the lateral sepals. The edges of the upturned part of the labellum are slightly wavy and there is a raised,fleshy green callus in its centre. Flowering occurs in October and November.

The lateral sepals are long and wide, the petals are long and wide and all spread horizontally near their bases but then suddenly taper and droop. The labellum is white, long, wide with narrow teeth, up to long along its edges. There are two or four rows of pale red calli in the centre of the labellum. Flowering occurs from September to mid-October.

The lateral sepals are long, wide and turned stiffly downwards. The petals are long and about wide and held horizontally or slightly upwards. The labellum is long and wide, white with red stripes and spots and the tip is curled under. The sides of the labellum have short, blunt teeth and there two rows of creamish-white, anvil-shaped calli, sometimes with red tips, along the centre.

The labellum is lance-shaped to egg-shaped, long and wide when flattened and curves downward at the tip. It is mostly yellowish with a dark reddish tip. Red teeth on the margins are about long but decreasing in size towards the front. There are four to six rows of well-spaced, foot-shaped calli along the centre of the labellum, decreasing in size towards the front.

The petals are narrow elliptic, long, wide, spread apart from each other and droop downwards on a dark coloured stalk long. The labellum is long and has three lobes. The centre lobe is broadly egg-shaped, wide and the side lobes are triangular, about long and wide. There are between two irregular ridge-like calli long at the base of the mid-line of the labellum.

Caladenia corynephora, commonly known as the club-lipped spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single erect, hairy leaf and one or two greenish- yellow and red flowers which have a labellum with a club-like tip. It is the only Western Australian caladenia with a clubbed labellum.

The sepals and petals have dark- coloured glandular hairs on their back surface. As is usual in orchids, one petal is highly modified as the central labellum. The labellum is glabrous, divided into three parts, roughly circular when flattened, with the lateral lobes erect cream-coloured with obvious parallel purple lines and irregular purple blotches. The central part has smooth yellow calli in two rows.

Drakaea gracilis is similar to others in the genus in that it has a single, ground hugging leaf and an underground tuber. In this case, the leaf is heart shaped, about in diameter, glabrous, dull blue-grey with darker lines radiating from the attachment to the stem. The stem is long and the stalk of the single flower is long. The flower is also similar to those of other hammer orchids in that the labellum resembles a flightless female thynnid wasp, except that in this species the column is pointed, the labellum lacks spots and the "neck" of the insect-like labellum is thinner than in other drakaeas.

The edges of the labellum are wavy and there is a yellowish-green and dark green callus in its centre. Flowering occurs in January and February.

The labellum is not lobed but has a small pouch. Orchids in the genus Spiranthes are similar but have oblong or egg-shaped, plain green leaves.

There are two rows of white, anvil-shaped calli, sometimes with red tips, along the centre of the labellum. Flowering occurs from July to mid- October.

There are two relatively large, egg-shaped calli at the base of the labellum. Flowering occurs from October to February, or to March in New Zealand.

There are two ridge-like calli long near the base of the mid-line of the base of the labellum. Flowering occurs in October and November.

There are two callus ridges long spreading apart from each other, near the mid-line of the labellum. Flowering occurs from September to November after fire.

The sepals and petals curve downwards. The labellum is long and wide with a channelled base and two orange bands. Flowering occurs between September and January.

There is a complex callus in the centre of the labellum. Flowering occurs from August to November in Australia and over a longer period in Asia.

The labellum is mauve with darker markings, long, wide and has three lobes with a central band of mauve hairs. Flowering occurs from November to March.

This orchid is a myrmecophyte and is pollinated by a male bull-ant (Myrmecia urens, Family Formicidae) when the ant attempts to copulate with the labellum.

The labellum is shoe-shaped or sac-like with a prominent spur near its base and has three lobes. The side lobes are broad and erect.

The labellum is rigidly fixed to the column and has three lobes, a concave upper "hypochile" and lower "epichile" and a sharp bend in its middle.

There is a dark purplish black callus in the centre of the labellum and covering about two-thirds of its surface. Flowering occurs from December to April.

There is a reddish to reddish black callus in the centre of the labellum and covering about half of its surface. Flowering occurs from March to May.

There is a fleshy, dark purplish black callus in the centre of the labellum and covering less than half of it. Flowering occurs between August and November.

There is a thick, tapering, dark purplish- red callus in the centre of the labellum and extending almost to its tip. Flowering occurs in December and January.

The lateral sepals turn downward with short tips curving forwards. The labellum is small, almost glabrous, dark brown and insect-like. Flowering occurs from September to November.

The labellum is oblong to egg-shaped, long, about wide, dark reddish black and covered with short, stiff hairs. Flowering occurs from late May to early August.

There are four or six rows of calli about long near the base of the labellum and tapering towards the tip. Flowering occurs in September and October.

There are four rows of widely spaced calli along the mid-line of the labellum. Flowering occurs from September to November but rarely occurs except after fire.

The petals are free from each other and usually smaller than the sepals. The labellum often has three lobes, in which case the side lobes are erect.

Unlike other spider orchids, the edge of the labellum lacks teeth and has purplish calli crowded along its centre line. Flowering occurs from late September to November.

The labellum is white with purple spots, about long and wide with a beak-like tip and a nectar bearing spur. Flowering occurs from June to August.

The entire upper surface of the labellum is covered with glands or calli and those nearer the tip are darker. Flowering occurs from late September to November.

There are four or six rows of white or reddish calli up to long in the mid-line of the labellum. Flowering occurs in September and October.

The labellum is about long and wide with three small lobes, the middle lobe short and fleshy with an inflated spur. Flowering occurs between August and September.

The labellum is boat-shaped, about long, wide, green and fleshy with a blunt appendage and a spur on its end. Flowering occurs from August to December.

There are two parallel, reddish brown, ridge-like calli about long near the mid-line of the base of the labellum. Flowering occurs in September and October.

The labellum is about long and wide with three lobes. The side lobes spread horizontally and the middle lobe points downwards. Flowering occurs between May and September.

The lateral sepals are about long, wide, have a prominent gland on the pointed tip and spread widely apart from each other. The petals are about long, wide with hairless edges and spread widely apart from each other. The labellum is about long, wide, with an irregular margin and a sharply pointed tip. There is a callus in the centre of the labellum and extending nearly to its tip.

The lateral sepals are linear to lance-shaped, long and about wide and are free each other. The petals are linear in shape, long and wide. The labellum is white, long, wide and turns upwards at about 90° near its middle. The upturned part has wavy edges and there is a broad egg-shaped, yellowish green callus with a dark green centre, in the middle of the labellum.

As with others in the genus, the flowers are inverted so that the labellum is above the column rather than below it. The dorsal sepal is egg-shaped, long and about wide. The lateral sepals are joined along their sides and the petals are linear to egg-shaped, about long and wide. The labellum is egg-shaped to broad lance-shaped, long, about long and white or greenish.

The lateral sepals are about long, wide and spread apart from each other. The petals are about long, wide and sharply pointed with short coarse hairs on their edges. The labellum is dark purple, broadly egg-shaped, thick and fleshy, about long, wide, with short glandular hairs on its edges. There is a small callus in the centre of the labellum and extending about half way to its tip.

The colour of the flower varies from pink to purple, or rarely white, and the scent is described as "foxy". The flowers have six tepals, being three small sepals and three petals. Two small petals are on the sides, while the third and lower (labellum) is large and trilobate. At the back of the flower there is a tubular spur of about long, while the labellum bears two lateral small flaps.

There is a glandular tip long on the dorsal sepal and long on the lateral sepals. The petals are lance-shaped to oblong, long, about wide and turn downwards against the ovary. The labellum is broadly egg-shaped to diamond-shaped, long and wide. Most of the upper surface of the labellum is covered by a dark blackish red, insect-like callus of stalked and clusters of stalkless glands.

The dorsal sepal is narrow oblong, about long, wide and turns downwards. The lateral sepals are egg-shaped, about long and wide and curve around the labellum. The petals are a linear in shape and similar in size to the sepals. The labellum is broadly egg-shaped, about long and wide with three blunt teeth on the end, the middle one longest and with a deeply pouched base.

Inside the petals are structures formed from four sterile stamens (staminodes): two lateral staminodes form what appear to be upright petals, about 1.4 cm long; two central staminodes are fused to form a lip or labellum, about 1.6–2.1 cm by 1–1.5 cm, which is deeply divided at the end into two lobes. The labellum has white lines at its base. The form in cultivation has purple flowers.

The sepals and petals are oblong to lance-shaped, long and wide. The labellum is pink or reddish with a white tip and white stripes inside, long and wide with three lobes. The middle lobe is more or less tube-shaped and the side lobes have wavy or crinkled edges. There is a whitish yellow spur long near the base of the labellum and a narrow raised callus in its centre.

The lateral sepals are long, wide and spread widely but with the tips turned downwards. The petals are long and wide and arranged like the lateral sepals. The labellum is long and wide, white near the base then bright red with the tip curled under. The sides of the labellum have teeth up to long and there four or more rows of red calli up to long along the centre.

The lateral sepals are oblong, long, about wide with their tips rolled downwards. The petals are oblong, about long, wide and are enclosed by the dorsal sepal. The labellum is oblong, long, about wide and curves downwards with thickened, wavy edges and a notched tip. The callus in the centre of the labellum is variable in shape, but never comma-shaped as in the otherwise similar M. eremicola.

The lateral sepals are greenish, linear to lance-shaped, long, wide and turn downwards, more or less parallel to each other. The petals are erect or curved backwards, have a dark brown stalk long with a blade long and wide. The labellum is egg-shaped, long and wide with side lobes long and about wide. There are two parallel ridge-like calli about long near the mid-line of the labellum.

The petals are more or less erect with an elliptic to oval blade long and wide on a purplish-brown stalk long. The labellum is long and has three lobes. The centre lobe is wedge-shaped, long, wide and the side lobes are asymmetric egg-shaped, long and wide with wavy or crinkled edges. There is a ridge-like callus in the mid- line of the base of the labellum.

The petals spread apart from each other, elliptic to egg-shaped, long and wide on a green to brown stalk long. The labellum is long and has three lobes. The centre lobe is broadly egg-shaped, long and wide and the side lobes are oblong to wedge- shaped, long and wide with irregular edges. There are two thick, brown, pimply callus ridges near the mid-line of the labellum.

The petals are held horizontally or droop with an elliptic blade long and wide on a green to purplish stalk long. The labellum is long and has three lobes. The centre lobe is egg-shaped, long and wide and the side lobes are linear, purplish-brown, about long and wide. There are two ridge-like calli about long near the base of the mid-line of the base of the labellum.

The lateral sepals are linear in shape, long and about wide. The petals are about long and wide, linear in shape except for near their base, which is wing-shaped. The labellum is tube-shaped, long and wide and the edges have many linear teeth. The central "boss" of the labellum is dome- shaped and white with a notch at the top and the surface is covered with short, stiff bristles.

The lateral sepals are linear, about long, wide and joined at their base. The petals are about long, wide, often with tip divided into two. The labellum is tube shaped near its base, the tube about long, then opens into a flattened area a further long and broad. There is a white patch in the centre of the labellum and the edges turn inwards and have a few short teeth.

The lateral sepals are similar in length to the dorsal sepal but have a pointed end and face forward beneath the labellum. The petals are somewhat shorter than the sepals, are lance-shaped and spread widely. The labellum is also shorter than the sepals, dished, broadly egg-shaped with the edges turned under, dull red with two rounded calli at its base. Flowering occurs between January and October.

The sepals and petals all turn downwards towards the ovary. The labellum is long about wide on a thin stalk or "claw" long. The labellum callus is insect-like and consists of a shiny black "head" with two antenna-like structures, a "thorax" with long purplish or reddish hairs and a pair of long branched tails with tiny bristles. There are two pairs of curved wings on the column.

The dorsal sepal is about long and wide and the lateral sepals are a similar length but narrower and parallel to each other. The petals are about long, wide and curve forwards. The labellum is pink or purplish, lance-shaped to egg-shaped, long, about wide and turns sharply upwards at about 90° near its middle. The middle of the labellum is narrowed and the upturned part has wavy edges.

The lateral sepals and petals have about the same dimensions as the dorsal sepal and turn stiffly downwards. The labellum is long and wide and green with a dark red tip that is curled downwards. The sides of the labellum have erect, linear up to long and there are four rows of dark red, densely crowded calli along the mid-line. Flowering occurs from October to early December.

The labellum is green to apricot-coloured, has a red tip and smooth edges. There is a band of calli along the centre of the labellum. It is distinguished from subspecies bryceana by its smaller calli and by its lateral sepals which have their edges rolled under. Flowering occurs between August and early September and is followed by a non-fleshy, dehiscent capsule containing a large number of seeds.

The dorsal sepal is erect and the lateral sepals spread apart and turned downwards. The petals spread horizontally near their bases but then turn downwards. The labellum is long, wide and cream coloured with red lines and marks. The sides of the labellum have many short blunt teeth, the tip curls under and there are two rows of anvil-shaped, white calli, sometimes with red tips, along its centre.

The dorsal sepal is erect, long and wide. The lateral sepals and petals are long and wide with the petals slightly narrower than the lateral sepals. The labellum is long and wide and white, with radiating red lines, spots and blotches. The sides of the labellum have short, curved teeth, the tip is turned downwards and there are two rows of broad, anvil-shaped, white calli along its centre.

The dorsal sepal is erect, long and about wide and the lateral sepals are long, wide, downswept near the base then curving forwards and slightly upwards. The petals are long, wide and downswept. The labellum is long, wide and green with a dark red tip. The sides of the labellum have narrow teeth and there are four or more rows of crowded, red calli along its centre including near its tip.

The lateral sepals are linear to lance-shaped, long, about wide and free from each other. The petals are linear to narrow oblong, long, about wide, purplish near the base and turn strongly forwards. The labellum is white, oblong, long, wide and turns sharply upwards near its middle. The edges of the upturned part of the labellum are slightly wavy and there is a yellowish-green callus in its centre.

The lateral sepals spread widely near their bases then hang. The petals are long and wide and arranged like the lateral sepals. The labellum is long and wide, white with red stripes, spots and blotches and the tip is curled under. The sides of the labellum have short, irregular serrations and there are six to twelve creamy-yellow, anvil-shaped calli with pink markings, in two rows along the centre.

Caladenia longicauda subsp. merrittii, commonly known as Merritt's white spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single hairy leaf and up to three large, mainly white flowers with very long, drooping lateral sepals and petals, and a white broad labellum with relatively short labellum teeth. It is one of the largest spider orchids.

The petals are egg-shaped, long, wide and spread apart from each other on a blackish stalk long. The labellum is long and has three lobes. The centre lobe is egg-shaped, long and wide and the side lobes are linear to narrowly wedge-shaped, long and wide with irregular edges. There are two pimply, darker yellow callus ridges in the lower part of the mid-line of the labellum.

The petals are more or less erect or turned backwards, spread widely apart from each other, long and wide on a dark green stalk long. The labellum is long and has three lobes. The centre lobe is broadly egg-shaped, long and wide and the side lobes are long and wide. There are two parallel callus ridges long near the mid-line of the base of the labellum.

The dorsal sepal is egg-shaped and long and the lateral sepals are a similar length but linear to lance-shaped and are free, or mostly free from each other. The petals are linear to lance-shaped, and curve forwards. The labellum is trowel-shaped, pink, long and turns sharply upwards near its middle. There is a brown or green, short, channelled and wrinkled callus in the centre of the labellum.

The dorsal sepal is broadly egg-shaped, green and long and the lateral sepals are a similar length but narrower and are free from each other. The petals are similar in size to the lateral sepals and curve forwards. The labellum is heart-shaped, purplish or pink, up to long and turns upwards. There is a deep purplish, triangular callus with a V-shaped ridge along the centre of the labellum.

The inflorescence is a raceme with from one to a few non-resupinate flowers. The sepals and petals (apart from the labellum) are narrow, free from and similar to each other. The most conspicuous part of the flower is the labellum which is attached to the base of the column and closely surrounds it. The fruit is a thin-walled capsule containing a large number of light coloured seeds.

It is long and wide, erect near the base but curves strongly forward near the tip. The fringe is composed of thread-like teeth up to long with pale whitish tips, decreasing in size towards the front of the labellum. There are four rows of pale maroon, golf stick-shaped calli in the centre of the labellum, decreasing in size towards its tip. Flowering occurs from August to September.

The sepals and petals are similar in size and shape and do not spread widely apart from each other, so that the flowers do not open widely. The portion of the flowering stem carrying flowers droops, so that although the flowers are non-resupinate, the labellum is the lowest part of the flower. The labellum has three lobes but lacks the spur or pouch of orchids in the similar genus Eulophia.

The petals usually spread widely while the sepals hang downwards. As is usual in orchids, one petal is highly modified as the central labellum. The labellum is separated from the sepals and other petals, its base attached to the base of the column. It is long, gently curved in a semi-circle, with three lobes, the central one egg-shaped to oval with its base surrounding the column.

The labellum is egg-shaped to oblong, long, wide, pale to yellowish green with a brown to blackish line along the middle. Flowering occurs from April to September.

The apical portion of the labellum (epichile) is triangular-lanceolate, usually purple-red and quite hairy. The spur is missing. The flowering period extends from March to June.

The edges of the labellum are flared and wavy near the tip and there is a fleshy green callus near its centre. Flowering occurs from December to January.

The lateral sepals form a small ledge or "mentum" with the base of the column. There is sometimes a sac-like structure at the base of the labellum.

There is a ridge-shaped callus in the mid-line of the base of the labellum and extending about half way along. Flowering occurs from August to December.

The tip of the labellum curls downwards and there are four rows of crowded calli up to long, along its mid-line. Flowering occurs from September to October.

There are two parallel callus ridges long at the base of the mid-line of the labellum and outlined with reddish brown. Flowering occurs in October and November.

The petals are about the same length but slightly narrower and often have twisted tips. The labellum is oblong, long, about wide and often has a twisted tip.

The petals are lance-shaped to egg-shaped, long and wide. The labellum is pink, thick and fleshy, about long and wide. Flowering occurs between November and February.

The petals are also free from each other and smaller than the lateral sepals. The labellum is often fleshy, curved and hinged to the base of the column.

There are four rows of calli long along the mid-line of the labellum and which decrease in size towards the tip. Flowering occurs from September to October.

The labellum is boat- shaped, about long, wide with a spur on its end and a few hairs inside. Flowering occurs sporadically but the flowers are self-pollinating.

There is a short, thick, channelled yellowish-green callus in the centre of the labellum. Flowering occurs in December and January but the flowers are relatively short-lived.

There is a broad, dense band of blackish calli up to long in the centre in the centre of the labellum. Flowering occurs from August to early November.

The labellum of Acianthus species produces a sweet nectar which is contained in a sunken area at the base of the labellum. The flowers of Australian species open in sequence up the flowering spike, each flower open for a few days, and are pollinated by fungus gnats from the families Anisopodidae, Sciaridae and Mycetophilidae. Usually only a small percentage of the plants in a colony have flowers. Flies on Acianthus caudatus have been observed to move up the labellum, probing with their proboscis until they reach the nectar, where the up and down "pumping" action of their bodies brings them into contact with the viscidium and pollinia which then adhere to the insect's body.

It was first described by the English botanist V.S. Summerhayes in 1928 as Eulophia seychellarum, a name that Summerhayes based on an unpublished manuscript name provided by Robert Allen Rolfe. Summerhayes later moved the species to the genus Eulophidium in 1957 and it was again transferred to the genus Oeceoclades in 1976 by Leslie Andrew Garay and Peter Taylor. Garay and Taylor noted that this species is similar to O. lanceata in vegetative morphology, but these species differ in floral characteristics, especially in the shape and proportions of the labellum. The midlobe of the labellum in O. seychellarum is proportionally shorter than that of O. lanceata when compared to the length of the entire labellum.

There is a dark reddish purple callus in the centre of the labellum and extending two-thirds of the way to its tip. Flowering occurs between December and April.

The sepals and petals are narrow and similar in size and shape to each other. The labellum is relatively broad and dished with a prominent spur at its base.

The labellum is 14–17 mm long, about 3 mm wide, curved, pointed and extends for about half its length above the sinus. Flowering occurs from February to June.

There are 10 to 15 bristles up to long on each side of the labellum and many short bristles on the "head" end. Flowering occurs from September to November.

There are two ridge- like calli long near the mid-line of the base of the labellum. Flowering occurs between September and December, reaching a peak in mid-October.

The petals are long and about wide. The labellum is wedge-shaped, bends downwards, long and wide with irregular teeth on the edge. Flowering occurs between November and March.

There are between two and four more or less parallel callus ridges in the lower part of the mid-line of the labellum. Flowering occurs in November and December.

The dorsal sepal is egg-shaped to lance-shaped, long, about wide and turned downwards. The lateral sepals are linear to lance-shaped, long, about wide and the petals are linear to narrow lance-shaped, long and about wide. The labellum is green to pinkish, broadly egg-shaped to lance-shaped, long, about wide and turns sharply upwards with wavy edges. There is a fleshy green to brown callus in the centre of the labellum.

The lateral sepals are linear to lance-shaped, about long, wide, with a pouched base and spread apart from each other. The petals are egg- shaped, long and about wide with a pointed tip. The labellum is egg-shaped with the narrower end towards the base, long, about wide and there is an narrow egg-shaped callus in the centre of the labellum and extending nearly to its tip. Flowering occurs from January to May.

Prasophyllum tadgellianum is a terrestrial, perennial, deciduous, herb with an underground tuber and a single stiff, erect, dark green, tube-shaped leaf long and in diameter near the base. Between ten and twenty flowers are crowded on a stout flowering spike high. The flowers are dark greenish-brown with a greenish, pink or white labellum and are usually lightly scented. They are inverted so that the labellum is above the column rather than below it.

The petals are long and wide and curve downwards with drooping tips. The labellum is long, wide, cream-coloured with many red teeth up to long on the sides and the tip curled under. There are four or six rows of reddish, foot-shaped calli, long, along the mid-line of the labellum and decreasing in length towards its tip. Flowering occurs from September to October, but flowering generally follows summer bushfires.

As with others in the genus, the flowers are inverted so that the labellum is above the column rather than below it. The dorsal sepal is egg-shaped to lance-shaped, long and wide. The lateral sepals are long, about wide and the petals are linear, to narrow lance-shaped, about long and wide. The labellum is green to pinkish, egg-shaped to lance-shaped, long, about wide and turns sharply upwards with wavy edges.

There is a glandular tip about long on the end of the dorsal sepal and long on the lateral sepals. The petals are narrow egg-shaped with the narrower end towards the base, long, about wide and turn downwards near the ovary. The labellum is wedge-shaped to trowel-shaped, long and about wide. There is a shiny black, insect-like callus about long and wide, occupying two-thirds of the labellum base.

The lateral sepals are similarly arranged but at the front of the flower. The dorsal sepal is long and wide, the lateral sepals are long and wide and the petals are long and about wide. The labellum is long and wide, diamond-shaped and prominently red-striped in the centre of the flower. In the centre of the labellum there is a dense cluster of reddish, club-shaped calli up to long.

In some caladenias, the sepal and petals (apart from the labellum) are narrow with expanded tips called "clubs". These are thought to be the source of sexual attractants for those species that mimic female wasps. Most such species do not have a scent detectable by humans but are attractive to male Thynnid wasps. For some species, such as C. multiclavia, it is the labellum that mimics the size, shape and presumably the scent of females.

The petals are 16–18 mm long, about 4 mm wide and spread horizontally. The labellum is 6–7 mm long, 6–8 mm wide and white with a yellow tip which has a few blunt teeth and curves downward. The sides of the labellum turn upwards and surround the column and there are two rows of yellow calli up to about 1.5 mm long along its mid-line. Flowering occurs from September to October.

Pterostylis squamata, commonly known as the southern rustyhood or ruddyhood, is a plant in the orchid family Orchidaceae and is endemic to south-eastern Australia. Flowering plants have up to ten translucent green flowers with reddish-brown markings and a hairy, insect-like labellum. Non-flowering plants have a rosette of four to eight egg-shaped leaves. This species is very similar to Pterostylis rufa which has a narrower labellum and other minor differences.

The base of the leaves typically sheathes the stem. The inflorescence is terminal and solitary, and the flowers form a cylindrical spike that ranges from sparse to dense. The flowers are typically resupinate, and often showy and colorful. The petals and labellum are typically entire, but in a number of North American species they may be fringed or edentate; in this group of species the labellum is also often deeply lobed or auricuate.

The petals are more or less erect or spread apart from each other, long and wide on a blackish stalk long. The labellum is long, turns slightly downwards and has three lobes. The centre lobe is narrow egg-shaped, long and wide and the side lobes are long, wide and spread apart from each other. There are two callus ridges long near the mid-line of the labellum and outlined in brownish red.

The petals are more or less erect or curved backwards, broadly egg-shaped, long and wide on a blackish stalk long. The labellum is long and has three lobes. The centre lobe is egg- shaped to wedge-shaped, long and wide and the side lobes are oblong to egg- shaped, long and wide. There are two callus ridges long and spreading apart from each other near the mid-line of the labellum.

It is pinkish grey with dark purple markings and forms a hood over the labellum. The lateral sepals are whitish, linear to lance-shaped, about long, and wide and spread widely apart from each other. The petals are lance-shaped, about long, wide and curved. The labellum is dark purple, tube-shaped near its base, about long, before curving and flattening into a broad egg-shaped flat long and wide with teeth on the edges.

The lateral sepals are long, pinkish with a red stripe down the centre and cross each other below the labellum. The petals are a similar colour, about long and project forward. The labellum is dark purplish-red to almost black, egg-shaped to lance-shaped, has a thick, fleshy callus covering most of the central area and many small pimple-like papillae on the outer half. It is long, wide with its edges turned under.

The lateral sepals and petals are long, wide with their outer surface covered with light red glandular hairs. The lateral sepals and petals are lance-shaped but curved and spread widely. The labellum is more or less egg-shaped when flattened, long and about wide, pink or white with pink blotches. There are golf-stick shape calli along the edges of the labellum and four rows of yellow to white calli in the centre.

The dorsal sepal and petals form a hood or "galea" over the column with the dorsal sepal having a narrow, upturned tip long. The lateral sepals turn downwards, are wider than the galea, dished, and suddenly taper to narrow tips long. The labellum is insect-like, about long, wide with a thin "body" and a thickened "head" end. Each side of the labellum has four to six forward- pointing bristles up to long.

The labellum of the Cypripedioideae is poke bonnet-shaped, and has the function of trapping visiting insects. The only exit leads to the anthers that deposit pollen on the visitor. In some extremely specialized orchids, such as the Eurasian genus Ophrys, the labellum is adapted to have a colour, shape, and odour which attracts male insects via mimicry of a receptive female. Pollination happens as the insect attempts to mate with flowers.

Prasophyllum crassum is a species of orchid endemic to South Australia. It has a single tube-shaped leaf and up to fifteen greenish and pinkish-brown flowers with a whitish labellum. It is a recently described plant, previously included with P. fitzgeraldii, but distinguished from that species by its smaller number of smaller, less colourful flowers and different labellum shape. It grows in the south-east of the state and usually only appears after fire.

The lateral sepals are linear to lance-shaped, long, about wide and diverge from each other. The petals are narrow egg-shaped, long, about wide with a long, pointed tip. The labellum is above the column and stiffly hinged to it, and is oblong, about long, wide with hairy edges and a pointed tip. The callus is narrow egg-shaped to lance- shaped and extends nearly to the tip of the labellum.

The petals are more or less erect, spread apart from each other with an elliptic to egg- shaped blade long and wide on a green stalk long. The labellum is long and has three lobes. The centre lobe is egg-shaped, wide and the side lobes are linear to oblong, long and about wide. There are two ridge-like calli about long near the base of the mid-line of the base of the labellum.

The dorsal sepal curves forward and is long and about wide. The lateral sepals and petals have about the same dimensions as the dorsal sepal although the lateral sepals are slightly wider. The labellum is long, wide and cream-coloured with red lines. The sides of the labellum sometimes have a few short teeth, the tip is curled under and there is a dense band of red or cream-coloured calli along the mid-line.

The dorsal sepal is erect, long and wide and the lateral sepals are long, wide, upswept and parallel to each other. The petals are long, wide and are arranged in a similar way to the lateral sepals. The labellum is wide, wide and green with a dark red tip. The sides of the labellum have narrow teeth and there are four or more rows of crowded, red calli along its centre, including near its tip.

As with others in the genus, the flowers are inverted so that the labellum is above the column rather than below it. The dorsal sepal is broadly egg-shaped, dished, long and the lateral sepals are narrow oblong, slightly longer than the dorsal sepal and free from each other. The petals are slightly shorter and thinner than the lateral sepals. The labellum is egg-shaped and turns sharply upwards about half way from its base.

The dorsal sepal is long, about wide and the lateral sepals are long, about wide, erect and free from each other. The petals are long, about wide and turn forwards. The labellum is greenish white with pink or mauve tinges, tapers to a point and turns sharply upwards near its middle. The edges of the upturned part of the labellum are slightly wavy and there is a callus in its centre, extending to its tip.

The petals are more or less erect with an egg-shaped blade long and wide on a greenish mauve stalk long. The labellum is long and has three lobes. The centre lobe is wedge-shaped to more or less round or kidney-shaped, wide and the side lobes are long and wide. There is a single yellow, ridge-like callus occupying about one-third of the length of the labellum near its base.

Diuris platichila, commonly known as the Blue Mountains doubletail, is a species of orchid that is endemic to a few isolated places in the Blue Mountains in New South Wales. It has two leaves and up to eight yellow flowers with dark markings on the dorsal sepal and labellum. It has relatively long, thin lateral sepals and the central lobe of the labellum is wedge-shaped. It forms hybrids with other species of Diuris.

The two lateral sepals are about the same length but very narrow and turned back against the ovary. As is usual in orchids, one petal is highly modified as the central labellum. The other two petals are erect, long, narrow, linear in shape but with a club-like end which has many glandular hairs. The labellum is about long and wide, hairy and greenish with reddish-brown spots and a comb-like fringe.

The dorsal sepal is broadly egg-shaped, erect near the base but bends at about 90° near the middle, forming a hood over the column. The labellum is more or less egg- shaped, long about wide when flattened and has three lobes. It is white with reddish-purple marks and a dark purple, pointed tip. The sides of the labellum are wavy, more or less erect and the tip is strongly curved downwards.

There is a thick, fleshy callus in the centre of the labellum, covering about half of its surface and extending almost to its tip. Flowering occurs between February and May.

The edges of the upturned part of the labellum are slightly wavy and there is a thick, fleshy green callus in its centre. Flowering occurs in late November and December.

The sepals are fleshy, long, about wide and the petals about long and wide. The labellum is about long and wide, fleshy and curved. Flowering occurs from May to June.

The petals are long and wide. The labellum is about long and less than wide, and curved with small lumps on the upper surface. Flowering occurs between September and February.

The lateral sepals overlap the base of the labellum which is usually white, has a pouched base and a number of stalkless glands. The column is short with two stigmas.

There are two ridge-like calli about long near the mid-line of the base of the labellum and bordered with reddish brown. Flowering occurs between late December and February.

The sides of the labellum lack the teeth of subspecies dentata but there are four rows of short, red calli along its mid- line. Flowering occurs from September to November.

There are four or six rows of pink calli along the centre of the labellum. In warm weather the flowers have a musky scent. Flowering occurs from August to September.

The sepals are long and wide and the petals are long and wide. The labellum is long and wide and faintly divided into three lobes. Flowering occurs between August and January.

The lateral sepals spread apart from each other and turn towards the back of the galea. The labellum is red becoming darker near the tip. Flowering occurs from October to December.

The sides of the labellum have short teeth, the tip curves downward and there are many rows of cylindrical calli along its mid-line. Flowering occurs from September to early November.

The labellum is about long with three lobes. The side lobes are short and erect and the middle lobe is short with a short spur. Flowering occurs between April and July.

Flowering occurs from August to early October. This subspecies differs from the other two subspecies in having sepals that are less than wide and a labellum that is more than wide.

There is a hinge between the column and the labellum, the latter with three lobes. The middle lobe is rounded and hollow, containing sticky nectar. Flowering occurs from July to August.

The dorsal sepal is erect, long, wide. The lateral sepals and petals are about the same length as the dorsal sepal but about twice as wide, spreading widely at their bases but drooping near their ends. The labellum is bright white with red stripes and spots, long, about wide, narrow triangular in shape with three lobes. The labellum has red teeth on the sides and two pairs of lines of cream-coloured calli along its centre.

The lateral sepals are linear to lance-shaped, about long, wide and spread widely apart from each other. The petals are egg-shaped, about long and wide with purple stripes and hairless edges. The labellum is purple, broadly egg-shaped, about long, wide, with a curled, sharply pointed tip and coarse hairs up to long on the sides. There is an narrow egg-shaped callus in the centre of the labellum and extending nearly to its tip.

The lateral sepals are linear to lance-shaped, about long, wide, and nearly parallel to each other. The petals are narrow egg-shaped, about long and wide with a pointed tip and sometimes a few hairs on the edges. The labellum is egg-shaped with the narrower end towards the base, long and wide with coarse hairs along its edges. There is a narrow triangular callus in the centre of the labellum and extending almost to its tip.

The lateral sepals are linear to lance-shaped, long, about wide and spread widely apart from each other. The petals are lance-shaped to egg-shaped, about long, wide and sharply pointed with hairless edges. The labellum is reddish, egg-shaped with the narrower end towards the base, about long, wide, with short hairs on its edges. There is a tapered, dark red callus in the centre of the labellum and extending nearly to its tip.

The labellum is white with purple bars, long, about wide when flattened, has three lobes and curves forward. The lateral lobes are about wide and erect. There are between four and eight pair of dark, purplish linear calli, decreasing in size towards the front along the sides of the labellum and two rows of white-stalked, dark headed calli on the mid-lobe. The column is long, erect and greenish with red marks and narrow wings.

Prasophyllum apoxychilum is a terrestrial, perennial, deciduous, herb with an underground tuber and a single tube-shaped leaf, long and wide, the free part long. Between eight and twenty flowers are arranged along a flowering spike long reaching to a height of . The flowers are scented, light green, wide with whitish petals and a white labellum. As with others in the genus, the flowers are inverted so that the labellum is above the column rather than below it.

The lateral sepals are linear to lance-shaped, long, about wide and free from each other. The petals are egg-shaped to lance-shaped, long, about wide and upswept with brown striations. The labellum is oblong to egg-shaped, long, about wide, curves upwards and tapers towards a narrow tip, sometimes reaching above the lateral sepals. The edges of the labellum are usually not crinkled or wavy but there is a fleshy, green, grooved callus in its centre.

The lateral sepals are 40–60 mm long, about 3 mm wide and curve downwards. The petals are 30–50 mm long, 2–3 mm wide and arranged like the lateral sepals. The labellum is 10–15 mm long, 7–10 mm wide and creamy-yellow with brown stripes and spots. The sides of the labellum are serrated, the tip is curled downwards and there are two rows of anvil-shaped, cream-coloured calli along the mid-line.

The lateral sepals are 60–80 mm long, about 3 mm wide and turn stiffly downwards. The petals are 50–75 mm long, 2–3 mm wide and turn slightly upwards. The labellum is 12–15 mm long, 7–9 mm wide and creamy-white with red stripes and blotches with the tip curled downwards. The sides of the labellum are serrated and there are two rows of anvil-shaped, white or creamy-white calli along the mid-line.

The petals are 28–45 mm long and 2–3 mm wide and sometimes have club-like tips although shorter than those on the sepals. The labellum is 13–15 mm long, 8–9 mm wide and cream-coloured with red marks. The sides of the labellum have narrow, linear teeth up to 3 mm long, the tip curls under and there are four rows of foot-shaped calli up to 1.5 mm long, along the centre.

Pterostylis metcalfei has a rosette of 3 to 5 leaves, each leaf long, wide, dark green and flat. The flower stem is 1 long and bears a single flower long and wide and shiny, greenish-white with darker green stripes. The dorsal sepal is erect at its base but then arches forward, forming a hood over the labellum and has a threadlike tip, long. The labellum is blunt, sharply kinked in the middle and is long and about wide.

The dorsal sepal is shorter but wider than two lateral sepals and forms a hood over the column. The long, narrow, lateral sepals hang like a pair of tails below the labellum. The petals are different from the sepals, having a narrow base with the main part widely expanded, in the form of donkey ears. As is usual in orchids, one petal is highly modified as the central labellum, differing markedly from the other petals and sepals.

The flowers are usually pale coloured with an erect dorsal sepal and spreading lateral sepals and petals. The petals and sepals are narrow lance-shaped and about as long as each other and the dorsal sepal. The labellum is stalkless, oblong and about as long as the sepals and petals with two bead-like glands and two ridges along its length. The column is curved with wings and is about half as long as the labellum.

The petals are more or less circular in shape, long and wide on a brown stalk long and held ear-like above the rest of the flower. The labellum is long and has three lobes. The centre lobe is heart-shaped to wedge shaped, long and wide and the side lobes are egg-shaped, long and wide. There are two callus ridges long and spreading apart from each other near the mid-line of the labellum.

The labellum is pale to deep pink, rarely white, lance-shaped to narrow egg-shaped, about long, wide and turns gently upward at 90° about half-way along. The upturned part is wavy with hair-like papillae on the edges. There is an egg-shaped, shiny, yellowish-green callus in the centre of the labellum and extending past its bend. Flowering mostly occurs in late September and early October and only lasts for two or three days.

Prasophyllum stygium, commonly known as the elfin leek orchid, is a species of orchid endemic to Victoria. It has a single tube-shaped leaf and up to twenty greenish-brown flowers with a white labellum. It is a recently described plant, previously included with P. fitzgeraldii, but distinguished from that species by its greenish-brown flowers with their white labellum and narrower brown callus. It is only known from a single population of about thirty plants.

The sepal at the back of the flower is long and the two at the sides are . The petals are also long. The insect-like labellum has a "head" about one-third long as the "body", has only a few hairs and is covered with dark lumps. The rest of the labellum (representing the female "body" of the insect) is dark maroon in colour, hairy on the upper two-thirds and glabrous on the lower part.

Inside the petals are structures formed from four sterile stamens (staminodes). Two lateral staminodes form what appear to be small petals, about 1–1.4 cm long by 0.3–0.5 cm wide, including a short narrowed "claw" at the base. Two central staminodes are fused at the base to form a lip or labellum, about 1.3–2 cm long by 0.8–2 cm wide. The labellum varies in how far it is split at the end into two lobes.

Caladenia longicauda subsp. clivicola, commonly known as the Darling Scarp white spider orchid, or hills white spider orchid is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single hairy leaf and up to three mostly white flowers with long, drooping lateral sepals and petals, a relatively small, narrow labellum and narrow labellum teeth. It grows in a restricted area, mostly on the Darling Scarp.

The lateral sepals are linear to lance-shaped, long, wide but narrow to a tip similar to that on the dorsal sepal. The petals are similar to the lateral sepals but slightly shorter and narrower. The labellum is whitish or pinkish, sometimes with red markings and is long, wide with erect lateral lobes. There are seven to nine calli about on the sides of the lobes and many short, white-tipped calli along the centre of the labellum.

The dorsal sepal is erect, long, wide and the lateral sepals are long, wide and spread stiffly near their bases, then turn downwards. The petals are long and wide and arranged like the lateral sepals. The labellum is long and wide with a dark maroon tip. The sides of the labellum have many spreading teeth up to long and there are four or more rows of crowded, deep red calli up to long along its centre.

The lateral sepals are long, wide and downturned near the base but deflected upwards nearer the tip. The petals are long and wide and spread widely or slightly downwards. The labellum is long and wide and green and white with a red tip and is delicately hinged to the column. The sides of the labellum have thin teeth up to long and there are four or more rows of densely crowded, red calli up to long in the centre.

The sepals and petals are held stiffly and spread obliquely downwards and are long and wide, tapering to a thread-like end with a densely glandular tip. The dorsal sepal is erect, linear to lance-shaped, about long and about wide at the base. The petals are narrower than the lateral sepals. The labellum is uniformly cream-coloured except for the red fringe on the edges and the red calli in the centre of the labellum.

The labellum is long, wide, pink or white and has three distinct lobes. The lateral lobes are pink with dark stripes, narrow oblong in shape, and sometimes have small teeth on the edge. The mid-lobe is white with a pinkish tip, triangular in shape and has three or four long, linear teeth on each side. There are two rows of yellowish calli with white tips in the centre of the labellum, forming a semi-circle.

The petals are long and wide at the base, slightly ascending then slightly curved downwards and sometime lack glandular tips. The labellum is dark pink with red stripes and ends in a dark tip. It is linear to heart-shaped, long and wide and curves downward at the front. The sides curve upwards and have a fringe of narrow teeth up to long but suddenly decreasing in length about half-way towards the tip of the labellum.

There is a callus in the centre of the labellum and extending almost to its tip. Flowering occurs between January and May in Australia and between February and October in New Zealand.

The labellum is white, suffused with pink, has frilly edges and is turned upwards towards the lateral sepals. Flowering occurs from August to October and is stimulated by fire or light disturbance.

The flower has similar star-shaped red sepals and petals, a pale yellow curved column, and a white fringed labellum. The sepals often have red streaks and spots on a white background.

The petals are oblong to lance-shaped and about long. The labellum is egg-shaped, long, turns upwards at about 90° and has slightly wavy edges. Flowering occurs from October to November.

The petals are long and about wide. The labellum is long, about wide and usually undivided. The nectary spur is long and more or less straight. Flowering occurs from January to March.

The sepals are narrower but longer than petals and are often a different colour. The labellum projects forwards and has three lobes with the side lobes erect and there are two pollinia.

Flowering occurs from August to early October. This subspecies differs from the other two subspecies in having lateral sepals that are not strongly upswept and a labellum that is less than wide.

The labellum is about long and wide with three lobes. The side lobes are erect, fleshy and triangular and the middle lobe has a short spur. Flowering occurs from December to May.

There are two rounded ridge-like calli about long at the lower half of the mid-line of the base of the labellum. Flowering occurs mainly from March to May, sometimes later.

The petals are long, about wide and curved. The labellum is egg-shaped, white or green with red markings, long, wide and erect with wavy edges. Flowering occurs in November and December.

The labellum is thick and waxy, about long and wide and has three lobes. The side lobes are erect and the middle lobe is short and fleshy. Flowering occurs between October and November.

In the case of A. Veitchii both the petals, sepals, and labellum move inward. Another common cross involving A. sesquipedale is A. Crestwood, which is a cross between A. Veitchii and A. sesquipedale.

The sides of the labellum have linear teeth up to long and there are four widely-spaced pale or deep red calli along its mid-line. Flowering occurs from September to early December.

Common dragon orchid is pollinated by male thynnid wasps when they try to copulate with the flower. A male Thynnoides bidens has been photographed on the labellum of a flower of this species.

Caladenia dorrigoensis is a plant in the orchid family Orchidaceae and is endemic to New South Wales. It has a single leaf and a single white flower with purple marks on its labellum.

At the base of the labellum there are two large, club-shaped calli joined at their bases, each with a fleshy black top. Flowering occurs from July to October, more prolifically after bushfire.

Leafless orchid flowers are highly fragrant and attract native bees. The yellow calli on a purple labellum resemble pollen-bearing stamens but the flower is nectarless, attracting the insects to an absent reward.

The lateral sepals are held close to the galea and have erect, thread-like tips long. The labellum is broad but not visible from outside the flower. Flowering occurs from July to September.

There is a channelled, egg-shaped callus in the centre of the labellum and extending almost to its tip. Flowering occurs between December and March in Australia and until August in New Zealand.

The upper part of the labellum is reddish with darker veins except for a white mound in the centre and many short red teeth around the edges. Flowering occurs in August and September.

The sides of the labellum have blunt, dark red teeth, its tip is rolled under and there are four crowded rows of calli along its mid-line. Flowering occurs in October and November.

The labellum is long, thick and waxy with three lobes. The side lobes are erect, about high and wide and the middle lobe is short and fleshy. Flowering occurs between September and November.

Flowers are bright yellow with a crisped margin, and some 9 cm across, with a large staminodial labellum, and resembling those of a pumpkin. The texture of the flower is soft and thin.

The lateral sepals are joined to each other and the petals face forwards. The labellum is white, turns upwards through about 90° and has a frilly edge. Flowering occurs from September to November.

The shape of the labellum is unusual in that it curves downward but with the tip turned up, producing an S-shape when viewed from the side. Flowering is from August to September.

The petals are long, about wide and almost translucent. The labellum is white or cream-coloured, long, wide with inward-pointing hairs on the inside. Flowering occurs from September to October in Australia.

The sepal and petals are about long and wide, the petals slightly narrower than the sepals. The labellum is about long and wide with a small callus. Flowering occurs from September to November.

The labellum has dark red stripes and is wedge-shaped, long with two longitudinal ridges along its midline. Flowering occurs between September and December but nearly always only after fires the previous summer.

The flowers of wasp, ant and bird orchids are pollinated by sexual deception (pseudocopulation) of thynnine wasps, except for C. cornuta which is self- pollinating. A key feature is that each species of orchid is pollinated by a different species of wasp. Male wasps are attracted by wind-borne pheromones released by glands on the sepals of the flowers. They usually land on the labellum, on another part of the plant or nearby and then walk or fly to the labellum.

The lateral sepals are linear to lance-shaped, about long, wide, stiffly erect and more or less parallel to each other. The petals are a narrow egg shape, about long and wide with dark coloured bands and hairless edges. The labellum is elliptic to broadly egg-shaped, about long, wide, thick and fleshy with coarse hairs on its edges. There is an narrow egg-shaped callus in the centre of the labellum and extending three-quarters of the way to its tip.

Caleana nigrita has a single smooth green or red leaf, long and wide. One or two greenish-yellow and red flowers, long and wide are borne on a stalk high. The dorsal sepal, lateral sepals and petals hang downwards with the dorsal sepal pressed against the column which has broad wings, forming a bucket-like shape. Two-thirds of the outer part of the labellum is covered with glossy black glands or calli and the labellum has a small hump at its centre.

The dorsal sepal is erect and the lateral sepals are elliptic in shape with a rounded end and are slightly larger than the petals. The labellum has three lobes with red stripes, the mid-lobe triangular in shape, curled under and dark yellow with a wavy edge. There are two rows of bright yellow-tipped calli along the mid-line of the labellum. Flowering occurs from October to December but the flowers are self-pollinating and only last for a few days.

The labellum is much larger when compared to their sepals and petals than it is on other species. Moreover, their petals are striped of brown and much smaller than the sepals, showing a greater difference than it is found on the other species. From each other, they can be separated mostly by the shape of the labellum. Scuticaria salesiana presents more rounded intermediate lobe, and Scuticaria peruviana has it more rectangular, with the apex truncated, almost in a straight line.

Microtis alboviridis is a terrestrial, perennial, deciduous, herb with an underground tuber and a single erect, smooth, tubular leaf long and wide. Between eight and forty or more greenish- white flowers are arranged along a flowering stem tall. The flowers are long, wide and as with many others in the genus, are sweetly scented. The flowers are similar to those of Microtis alba, but apart from being small, the flowers have an upturned tip on the labellum and the labellum has smaller lobes.

The genus Crepidium was first raised and formally described in 1825 by Carl Ludwig Blume and the description was published in his book Bijdragen tot de flora van Nederlandsch Indië. The name Crepidium is derived from the Latin word crepida meaning "boot", "sandal", "shoe" or "base", possibly referring to the shape of the labellum. Some authors previously included species in this genus in Malaxis but Crepidium have stems lying above ground, broad leaves and an undivided labellum with ear-like lobes.

Inside the petals are structures formed from four sterile stamens (staminodes). Two lateral staminodes form what appear to be small petals, about 1.6–2 cm long including a 0.2–0.5 cm narrowed "claw" at the base. Two central staminodes are fused at the base to form a lip or labellum, about 3.6–4.5 cm long by 2.5–3.5 cm wide. The labellum is purple with a "crumpled" surface and is split at the end for up to 1.5 cm into two lobes.

The labellum has many rounded teeth up to 1 mm long on its sides, the tip is curled under and there are four rows of crowded, fleshy, blackish, club-shaped calli up to 1 mm long, along its mid-line. Flowering occurs from August and September. This species is similar to the related Caladenia concinna from New South Wales but differs from that species by in having darker-coloured flowers shorter labellum teeth and fewer calli rows than that species.

The dorsal sepal and petals form a hood called the "galea" over the column with the dorsal sepal having a narrow tip long. The lateral sepals are much wider than the galea, have densely hairy edges and taper suddenly to narrow, thread-like tips long which spread apart from each other. The labellum is dark brown, fleshy and insect-like, long and about wide. The centre of the labellum has a channel and the edges have bristly hairs up to .

The lateral sepals are long and wide but suddenly taper like the dorsal sepal to a glandular tip. The petals are long and wide and also taper to a thread-like, glandular tip. The labellum is egg-shaped to lance-shaped, long and wide and erect near its base before curving downwards. The side lobes of the labellum are erect, about wide with between seven and twelve thread like teeth about long on each side, each with a small egg-shaped tip.

The lateral sepals and petals are about the same size as the dorsal sepal, with the petals spreading and the lateral sepals parallel to and often touching each other along their length. The labellum is about 3 mm long and 2 mm wide, pink or white with red bars. The sides of the labellum turn upwards and almost surround the column and the tip is a small yellow triangle with a few blunt teeth on its sides. Flowering occurs in October.

The lateral sepals and petals are usually long with their outer surfaces covered with glandular hairs. Their outer surface is greenish-pink, sometimes striped, and the inner surface is pinkish or greenish white. The labellum is roughly egg- shaped, long and wide, white or pinkish with prominent red stripes. The sides of the labellum turn upwards while the centre part has a toothed edge, usually with yellow calli and there are two lines of raised, club-like, yellow-tipped calli in the centre.

The lateral sepals are linear to lance-shaped, long, wide and free from each other. The petals are narrow linear, long, about wide and white with a purplish central line. The labellum is white, oblong to elliptic in shape, about long, about wide and turns sharply backwards on itself near its middle. The edges of the upturned part of the labellum have crinkled edges and there is a greenish-yellow, fleshy, raised callus in its centre extending just past the bend.

Prasophyllum roseum, commonly known as the pink lip leek orchid, is a species of orchid endemic to southern continental Australia. It has a single tube- shaped leaf and up to thirty greenish flowers with a pink labellum. It is a recently described plant, previously included with P. fitzgeraldii, but distinguished from that species by its smaller, less crowded flowers, with more spreading lateral sepals and different labellum callus. It grows in the south-east of South Australia and in western Victoria.

The dorsal sepal is smaller than the other two sepals, is dished and erect but curves forward to form a hood over the labellum. The lateral sepals are much longer, broader and more conspicuous than the dorsal sepal and are white to pink and spreading. As is usual in orchids, one petal is highly modified as the central labellum. The other two petals are usually smaller and narrower than the sepals and are either erect, spreading or curved backwards towards the ovary.

The petals are more or less erect and spread apart from each other, egg-shaped to elliptic, long and wide on a purplish brown stalk long. The labellum is long, turns slightly downwards and has three lobes. The centre lobe is broadly egg-shaped to wedge-shaped, long and wide and the side lobes are egg-shaped with the narrower end towards the base, long and about wide. There are two callus ridges long near the mid-line of the labellum.

Two central staminodes are fused at the base to form a lip or labellum, about 2.2–4.5 cm long by 1.6–4.5 cm wide. The labellum is deeply lobed and has three white lines at the base of each lobe. The single functional stamen has a white anther, about 6–9 mm long, and the typical Roscoea "spurs" on the filament – blunt-tipped in the case of R. wardii. The three-celled ovary is about 3 cm long when matured with seeds.

Caladenia longicauda subsp. calcigena, commonly known as the coastal white spider orchid, is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. It has a single hairy leaf and up to four mostly white flowers. It grows in coastal sand on the west coast and is distinguished from other subspecies growing in the same area, by its longer sepals and petals, small, narrow labellum and by the arrangement of the calli on its labellum.

Rafinescque, Constantine S. (1838). Gynizodon russelliana in Flora Telluriana 4: 40.. Both Macrochilus and Gynizodon are synonyms of Miltonia and no other species has ever been submitted to them. Miltonia russelliana This is the less showy of Miltonia species because its sepals and petals do not really open, being always bent over the column, revealing only the lighter tip of its purple labellum. Miltonia clowesii This species has the same color pattern of M. russelliana, however, with a whiter labellum.

The dorsal sepal is erect, long, wide and the lateral sepals are a similar size but upswept and parallel to each other. The petals are long and about wide and arranged like the lateral sepals. The labellum is long and wide and green with a dark red tip. The sides of the labellum have narrow teeth up to long and there are four or more rows of crowded, red calli up to long along its centre including near its tip.

The lateral sepals are long, about wide and the petals somewhat shorter and narrower. The petals and sepals narrow abruptly at about their midpoint, linear nearer their bases then thread-like towards the ends. The labellum is linear to egg-shaped when flattened, about long and wide, pale yellow or greenish-yellow, maroon in the central part. There are many short, tooth-like calli along the edges of the labellum and four to six rows of greenish to reddish calli in the centre.

As is usual in orchids, one petal is highly modified as the central labellum. The labellum is gently curved near its base where it encloses the base of the column but more strongly curved near its tip, which is deeply fringed. The column is about , straight or gently curved with the anther at its tip. Flowering occurs between August and early December, depending on species and the fruit that follows flowering is a non- fleshy, dehiscent capsule containing up to 500 seeds.

There are five to eight linear teeth up to long on each side of the labellum and four rows of hockey stick-shaped calli along its mid-line. Flowering occurs in October and November.

There are four rows of dark maroon calli in the centre of the labellum, the longest ones flat-topped and long. The column is long and curved with broad wings. Flowering occurs in October.

The sepals and petals turn forwards and the lateral sepals are free from each other. The labellum is turned only slightly upwards and has a slightly frilly edge. Flowering occurs from September to October.

The sinus between the lateral sepals has a small notch in the centre a brownish central area. The labellum is long, about wide and hidden inside the flower. Flowering occurs in July and August.

The labellum is long and wide with three lobes. The side lobes are erect and the middle lobe is yellowish and has a shiny ridge along its midline. Flowering occurs between August and February.

The sinus between the bases of the lateral sepals bulges forward and curves inward at the top. The labellum is not visible from outside the intact flower. Flowering occurs mainly in February and March.

Leptotes bicolor is a miniature sized epiphyte. The pseudobulbs are terete and the fragrant flowers are borne in groups of 1-3 and are mostly white with a prominent purple patch on the labellum.

The labellum has a spur and usually three lobes which may be short or long and threadlike. The distinguishing feature of the genus is the presence of two club-shaped projections on the stigma.

The upturned part has crinkled edges and there is a raised, shiny green or brownish callus in the centre of the labellum and extending almost to its tip. Flowering occurs from August to October.

The petals are more or less triangular, about long and wide. The labellum is long, about wide with its tip divided into three lobes about long and wide. Flowering occurs from March to May.

The labellum is shaped like a trident and has three lobes about long and wide. The nectary spur is green with a white base, long and about wide. Flowering occurs from December to January.

There are four crowded rows of dark red, stalked calli which are up to long near the base of the labellum but decreasing in size towards its tip. Flowering occurs from September to October.

The labellum has a flattened top and is held below horizontal with one-half to one-third of its outer part covered with glossy black glands or calli. Flowering occurs from October to early December.

The sepals are about long and wide, the lateral sepals are long, the petals about long and wide. The labellum is orange, about long and wide curved and fleshy. Flowering occurs between August and December.

The flowers are green, tiny (3 mm diameter), and short-lived on green stems 30–60 mm tall. The callus plate extends for the length of the labellum. The anther is green, pink or purplish.

The labellum is boat-shaped, about long and wide three lobes. The side lobes are erect, curve inwards and touch. The middle lobe has a cylindrical spur about long. Flowering occurs from August to November.

The sepals are about long and wide, the petals about long and wide. The labellum is about long and wide with three short lobes and a spur about long. Flowering occurs from February to April.

Diuris striata is a poorly-known species of orchid that is endemic to New South Wales. It has a two grass-like leaves and about four mauve flowers with dark purple streaks on the labellum.

The lateral sepals are linear to lance-shaped, about long, wide, have pointed tips and spread widely apart from each other. The petals are lance- shaped to broad egg-shaped, about long and wide with hairy edges and a sharply pointed tip. The labellum is lance-shaped to egg-shaped, about long, wide, with a curled, sharply pointed tip and long, coarse hairs on the sides. There is an oblong callus in the centre of the labellum and extending about half way to its tip.

Prasophyllum amoenum is a terrestrial, perennial, deciduous, herb with an underground tuber and a single tube-shaped leaf, long and wide, the free part long. Between five and twelve flowers are loosely arranged along a flowering spike long reaching to a height of . The flowers are greenish, long and wide with dark brown lateral sepals, white and red petals and a white or pinkish labellum. As with others in the genus, the flowers are inverted so that the labellum is above the column rather than below it.

It is occasionally found in wet swales adjoining freshwater sandy beaches. Preferring cooler habitats, its range is being pushed northwards as global temperatures warm. Correll refers to locations of altitudes in Vermont, altitudes in Virginia and altitudes in North Carolina and Tennessee. It is often confused with its relative, Platanthera grandiflora, which generally has larger flowers (lip or labellum long), and has a circular nectary opening, compared to P. psycodes which has smaller flowers (the labellum measuring from long) and an oblong or almost rectangular opening.

The two other species from Espírito Santo State are highly different from each other. Scuticaria kautskyi usually has more or less uniform orange color on its sepals and petals, with their bases slightly lighter and dotted of greenish-yellow. Their labellum is white showing few colored drawings and narrow terminal lobe, slightly deflected. The other species from this state, Scuticaria novaesii presents flowers with green- yellow segments, intensely spotted with dark brown and wide and flat labellum terminal lobe, with clearly marked by radial multicolored lines.

The dorsal sepal and petals form a hood or "galea" over the column with the dorsal sepal having a narrow tip long. The lateral sepals turn downwards, about the same width as the galea and suddenly taper to narrow tips long which spread apart from each other. The labellum is dark brown, thick, fleshy and insect-like, about long and wide. The "head" end of the labellum has a few short hairs and there are six to nine longer bristles on each side of the "body".

Caleana triens has a single smooth, dull green or dull red leaf, long and wide. Usually only one greenish yellow and red flower, long and wide is borne on a thin, wiry stalk high. The dorsal sepal, lateral sepals and petals are narrow and hang downwards with the dorsal sepal pressed against the column which has broad wings, forming a bucket-like shape. The labellum is flattened and only about one-third of the outer part of the labellum is covered with glossy black glands or calli.

The lateral sepals are 25–30 mm long and 4–5 mm wide, spread apart from each other and curve downwards. The petals are 20–25 mm long, about 3 mm wide and curve downwards. The labellum is white or pinkish, 9–13 mm long, 6–8 mm wide with many pinkish teeth up to 1.5 mm long on the sides. The tip of the labellum is curled under and there are four rows of pinkish calli up to 1 mm long, along its mid-line.

The lateral sepals have similar dimensions to the dorsal sepal, spread apart from each other and curve downwards. The petals are long, about wide and arranged like the lateral sepals. The labellum is greenish-yellow, long, wide with yellow or red, club-shaped teeth up to about long on the sides but decreasing in length towards the tip. The tip of the labellum is curled under and there are four or six rows of calli up to 1 mm long, along its mid-line.

Prasophyllum spadiceum, commonly known as the brown lip leek orchid, is a species of orchid endemic to southern continental Australia. It has a single tube-shaped leaf and up to thirty pale green, brown and white flowers with a whitish labellum. It is a recently described plant, previously included with P. fitzgeraldii, but distinguished from that species by its smaller, paler flowers, whitish labellum and brown callus. It grows in the south-east of South Australia and in a single location in western Victoria.

Pterostylis montana is a species of greenhood orchid endemic to New Zealand. Flowering plants have erect, linear leaves on the flowering stem with a single green flower with translucent white stripes and an unusual twisted labellum.

The generic name Coeloglossum is derived from the Greek ' meaning "hollow tongue", referring to the hollow spur on the tongue-like labellum. The 'frog' in frog orchid refers to the shape and colour of the flowers.

The lateral sepals taper suddenly to narrow tips and there is a broad, sloping, V-shaped sinus between them. The labellum is erect and green and protrudes through the sinus. Flowering occurs in November and December.

There is a small notch in the sinus between the bases of the lateral sepals. The labellum is about long, about wide and is not visible from outside the flower. Flowering occurs from January to March.

The labellum is thin, green and insect-like, about long and wide. The "head" end has two long bristles and there are 18 to 24 shorter bristles on the side. Flowering occurs from October to November.

There are two ridged calli about long in the mid-line of the labellum. The species is similar to D. pardina but has lighter coloured flowers with smaller brown markings. Flowering occurs from July to November.

The petals are a similar size to the lateral sepals. The labellum is long, about wide and sometimes has three lobes. When present, the nectary spur is up to long. Flowering occurs from March to April.

The wingspan is 28–31 mm. Adults are on wing from June to July. The larvae have only been recorded on Delphinium trolliifolium. Covell and Medley (1986) reported adults trapped in the labellum of Cypripedium kentuckiense.

The sepals are turned back towards the ovary. The labellum is about long with three lobes. The side lobes spread apart and the middle lobe has a crater-like pit. Flowering occurs between February and June.

The inflorescences are racemose. Flowers are pink with long petals. The sensitive labellum is hood-like and dark red with yellow appendages. L. chippendalei is most closely related to L. preissii but differs in flower morphology.

The petals are also clubbed but spread upwards. The labellum is red with fringes of pointed calli and two pairs of rows of deep red calli along its centre. Flowering occurs between late July and mid- October.

Published on Internet. Finally, in 1947, Frederico Carlos Hoehne described a new species, Scuticaria strictifolia, yet similar to Scuticaria hadwenii, although showing some slight differences on the labellum structure, besides their normally lithophytic habit and erect leaves.

Diuris conspicillata was first formally described in 1991 by David Jones and the description was published in Australian Orchid Review. The specific epithet (conspicillata) refers to the markings on the labellum which give the impression of spectacles.

The petals are about long and wide and are held under the dorsal sepal. The labellum is long, about wide with a lumpy edge and a shallow notch on the tip. Flowering occurs from May to October.

The labellum is white with a red blotches, long, wide with three lobes. The side lobes are erect and the middle lobe is fleshy and downturned with a spur about long. Flowering occurs from July to October.

The sinus between the bases of the lateral sepals bulges forward and has a small notch in the centre. The labellum is long and and not visible outside the intact flower. Flowering occurs from November to March.

The labellum is dark purple, fleshy, curved, long and about wide with a groove along its midline. Flowering occurs between January and March in Australia, October and January in Africa and throughout the year in New Guinea.

The sepals are about long and wide, the petals a similar length but only about half as wide. The labellum is about long and wide and is unlobed. Flowering occurs between August and October.Orchard, A.E. (ed.) (1994).

The labellum is long, wide and pale green with three lobes. The middle lobe turns downwards and is wavy but the side lobes are upright. Flowering occurs between September and November in Australia and in June China.

The upturned part is wavy or crinkled on the edges. There is a lance-shaped to egg-shaped, coffee- coloured callus in the centre of the labellum and extending almost to its tip. Flowering occurs in October.

The callus and associated glands occupy most of the upper surface of the labellum. The column is pale green with a few purple spots, long and about wide with narrow wings. Flowering occurs in July and August.

Orchis purpurea may be mistaken for the military orchid (Orchis militaris) or monkey orchid (Orchis simia). The three species often hybridize, making them difficult to identify, although the shape of the labellum is distinct to each species.

The sides of the labellum have short, blunt, dark red teeth, its tip is rolled under and there are four or six well-spaced rows of calli along its mid-line. Flowering occurs in September and October.

The edge of the labellum has narrow teeth up to long and there are four or more rows of deep red calli up to long crowded along its centre line. Flowering occurs from September to early November.

There are four regular rows of thick, club-shaped calli which decrease in size towards the tip of the labellum. The column is bent forwards, has wavy wings and red spots. Flowering occurs from September to November.

There are no teeth on the sides of the labellum but there are two or four rows of thick, club-shaped calli in the lower central part but not extending towards the tip. Flowering occurs from August to November. This caladenia is similar to C. tessellata but differs from it in having generally larger flowers lacking teeth on the edge of the labellum and calli not extending to its tip. Some individual plants are intermediate in form, suggesting the species are not completely distinct or are possibly hybrids of the two.

Corunastylis ciliata, commonly known as the fringed midge orchid, is a small terrestrial orchid endemic to southern Australia. It has a single thin leaf fused to the flowering stem and up to fifteen small, green to greenish yellow flowers with purplish markings and a reddish purple labellum. It was formerly included with Corunastylis archeri, and C. ciliata is regarded as a synonym of Genoplesium archeri by the World Checklist of Selected Plant Families. Plants in this species have fewer, more erect flowers, a less-hairy labellum and have different coloration than C. archeri.

Bifrenaria leucorhoda is one of the easier to identify small species because of its delicate pale pink flowers and darker purple veins on the labellum. Two species similar to Bifrenaria, but that showed a highly salient claw at the base of the labellum and lateral lobes abruptly divided were then classified under this genus. In 1914, Rudolf Schlechter suggested they should be classified under the genus Lindleyella, with Lindley's Bifrenaria aurantiaca (which presented the mentioned differences) as the type. However this genus name was already occupied (It is a synonym of Lindleya, in the Rosaceae).

Inside the petals are structures formed from four sterile stamens (staminodes): two lateral staminodes form what appear to be small upright petals, 1.1–2.5 cm long; two central staminodes are fused at the base to form a lip or labellum, 3–4.1 cm long by 2.1–3 cm wide. The labellum bends backwards and is split from about half way into two lobes. The single functional stamen has a cream anther, about 5–8 cm long, with 5–9 mm long spurs formed from the connective tissue between the two capsules of the anther.

Prosthechea cochleata, formerly known as Encyclia cochleata, Anacheilium cochleatum, and Epidendrum cochleatum and commonly referred to as the clamshell orchid or cockleshell orchid, is an epiphytic, sympodial New World orchid native to Central America, the West Indies, Colombia, Venezuela, and southern Florida.Encyclia cochleata Each oblong discoid pseudobulb bears one or two linear nonsucculent leaves. The flowers are unusual in that though the labellum is usually below the column in the orchids, in the members of Prosthechea the labellum forms a "hood" over the column. This makes the flower effectively upside down, or non-resupinate.

Caleana alcockii has a single smooth green or red leaf, long and wide. Usually only one greenish-yellow and red flower, about long and wide is borne on a thin, wiry stalk high. The dorsal sepal, lateral sepals and petals are narrow and hang downwards with the dorsal sepal pressed against the column which has broad wings, forming a bucket-like shape. About one-third of the outer part of the labellum is covered with glossy black glands or calli and the labellum has a prominent hump at its centre.

The single functional stamen has a linear white anther with a pointed yellow spur formed from the connective tissue between the two capsules of the anther. R. × beesiana differs from its putative parents in flower colour and in several other ways. It has a more deeply divided labellum than R. auriculata, whose labellum is either unlobed or lobed to less than half its length. Unlike R. cautleyoides, it has leaves with small "ears" at the junction of the blade and sheath and larger bracts, over rather than under 6 cm long.

The lateral sepals are 40–60 mm long, 3–5 mm wide and spread stiffly apart from each other. The petals are 30–37 mm long, about 3 mm wide, and arranged like the lateral sepals. The labellum is white, pink or purplish, 12–16 mm long and 7–9 mm wide. The sides of the labellum have narrow teeth up to 3mm long, decreasing in length towards the tip which is curled under, and there are four or six rows of pink or purplish calli up to 1 mm long, along its centre.

The labellum is 9–15 mm long, 7–11 mm wide and cream coloured with red lines. The sides of the labellum have short, blunt teeth, the tip curls under and there are two rows of anvil-shaped, mostly cream-coloured calli along the mid-line. Flowering occurs from July to mid-October. The colour of the flowers of this orchid vary from glistening white to dull white or pale creamy white and in some areas the plants grow in large clumps and in others whereas in others they are solitary.

The dorsal sepal and petals are fused, forming a hood or "galea" over the column with the dorsal sepal having an upturned, thread-like tip about long. The lateral sepals are about the same width as the galea, egg-shaped and turned downwards, joined for part of their length and taper to a narrow or thread-like tip long. The labellum is insect- like, about long, wide, dark reddish brown and fleshy. There are five to seven hairs up to on each side of the labellum and many shorter hairs on the "head" end.

Orchids in the genus Caleana are pollinated by male thynnid wasps which are attracted to the flower by pheromones. When a wasp lands on the labellum, in its attempt to copulate with it, the labellum is flipped downwards against the column. If the flower has not previously been visited, pollinia in the column will adhere to the insect's back. When that insect visits another duck orchid and the process is repeated, the transported pollinia will adhere to the stigma of the second flower and it will be pollinated.

Pterostylis longifolia, commonly known as the common leafy greenhood or tall greenhood, is a plant in the orchid family Orchidaceae and is endemic to eastern Australia. Flowering plants have up to seven flowers which are green, partly transparent and which have a labellum which is pale green and hairy with a blackish central stripe. Non-flowering plants have a rosette of leaves but flowering plants lack the rosette, instead having five to eight stem leaves. A similar species, Pterostylis melagramma has paler green flowers which have a less hairy labellum.

The lateral sepals are linear to lance-shaped, long, about wide and spread slightly apart from each other. The petals are narrow linear to oblong, long and about wide with a purple line in the centre. The labellum is white, oblong in shape, about long, wide and turns sharply upwards and slightly backwards on itself near its middle. The edges of the upturned part of the labellum have irregularly crinkled edges and there is a greenish-yellow, fleshy, raised callus in its centre and extending just past the bend.

The mouthparts of insects that feed on fluids are modified in various ways to form a tube through which liquid can be drawn into the mouth and usually another through which saliva passes. The muscles of the cibarium or pharynx are strongly developed to form a pump. In nonbiting flies, the mandibles are absent and other structures are reduced; the labial palps have become modified to form the labellum, and the maxillary palps are present, although sometimes short. In Brachycera, the labellum is especially prominent and used for sponging liquid or semiliquid food.

Prasophyllum nitidum, commonly known as the shining leek orchid, is a species of orchid endemic to southern continental Australia. It has a single tube- shaped leaf and up to twenty maroon, magenta or purple and green flowers with a pale purple to maroon labellum. It is a recently described plant, previously included with P. fitzgeraldii, but distinguished from that species by its shorter flower spike, glossy flowers and shining, raised labellum callus. It grows in the south-east of South Australia and in a single location in western Victoria.

Drakaea glyptodon is similar to others in the genus in that it has a single, ground hugging leaf and an underground tuber. In this case, the leaf is heart shaped, about in diameter, glabrous, dull blue-grey with darker lines radiating from the attachment to the stem. The stem is long and the stalk of the single flower is long. Its flower is also similar to those of other hammer orchids in that the labellum resembles a flightless female thynnid wasp, except that the labellum is shorter and more swollen than those of other drakaeas.

The lateral sepals are 15–25 mm long and 3–5 mm wide, curve downwards and are nearly parallel to each other. The petals are 15–25 mm long and about 2 mm wide and also curve downwards. The labellum is cream-coloured to green, often with a dark red tip and is heart-shaped, 8–9 mm long and wide. The sides of the labellum often have a few short, blunt teeth, the tip is curled under and there are four to six rows of shiny black calli in the lower central part.

The arching lateral sepals and petals are similar in size, shape and colour to the dorsal sepal although the petals are slightly narrower and shorter. The labellum is white with red markings, and curves forward with white to pale red teeth along its margins, the teeth decreasing in size towards the tip. There are up to 13 pairs of anvil-shaped, cream-coloured calli in two rows along about half the length of the labellum and decreasing in size towards the tip. Flowering occurs from August to early September.

The arching lateral sepals and petals are similar in size, shape and colour to the dorsal sepal although the petals are slightly narrower and shorter. The labellum is white with pale red markings, and curves forward with white to pale red teeth along its margins, the teeth decreasing in size towards the tip. There are up to 13 pairs of anvil-shaped, cream-coloured calli in two rows along about half the length of the labellum and decreasing in size towards the tip. Flowering occurs between August and early October.

Inside the petals are structures formed from four sterile stamens (staminodes): two lateral staminodes form what appear to be small upright petals, which are about long; two central staminodes are fused to form a lip or labellum, long by about wide. The labellum does not bend downwards and is split into two lobes for about half its length. The single functional stamen has a yellow anther, about long, with long spurs formed from the connective tissue between the two capsules of the anther. The stigma is funnel-shaped.

Each side of the labellum has six to eight dark red teeth up to long and there are four or six well-spaced rows of dark red calli along its mid-line. Flowering occurs from November to January.

The labellum is white with purple markings, about long and wide with three lobes. The side lobes are curved and the middle lobe is oblong with an orange ridge along its midline. Flowering occurs from July to November.

The sinus between the bases of the lateral sepals bulges forward and has a small notch in the centre. The labellum is about long, wide and is not visible above the sinus. Flowering occurs from January to May.

The petals are a similar size to the sepals but project forwards. The labellum is long and wide and has three lobes. The middle lobe has three purple ridges and a curved tip. The side lobes curve upwards.

There is a callus consisting of a hairy plate and two round ridges in the centre of the labellum. Flowering occurs from August to December and is followed by the fruit which is a capsule long and wide.

The lateral sepals almost close off the front of the flower and the sinus between them has a dark green central area. The labellum is long, wide and hidden inside the flower. Flowering occurs from June to September.

The lateral sepals are narrow triangular, about long and turn downwards. The petals are less than long. The labellum is much shorter than the dorsal sepal, smooth and has a whitish tip. Flowering occurs from February to May.

The petals are also a similar length but only about wide. The labellum is long and wide with a square-cut or rounded tip and turns sharply downwards. The column is green. Flowering occurs between December and February.

Flowering occurs from March to August and the capsule that follows is oval-shaped, long and about wide. This species is distinguished from the similar A. exsertus by its usually smaller leaf, smaller flowers and much smaller labellum.

The tip is shallowly three-lobed. The flower is often flesh-coloured (the meaning of incarnata) and the labellum normally has loop-shaped markings. The flowering period is from May to mid-July, dependent on latitude and subspecies.

The specific epithet (rhomboidiformis) is derived from the Ancient Greek word ῥόμβος rhombos meaning "rhombus", the suffix oid meaning "likeness" and the Latin word forma meaning "shape" or "figure" referring to the diamond-shaped labellum of this orchid.

The sides of the labellum have many short blunt teeth, the tip curls under and there are two rows of anvil-shaped, white calli, sometimes with red tips, along its centre. Flowering occurs from August to mid December.

The labellum is about long and wide with three lobes. The side lobes are about long, narrow, curved and pointed. The middle lobe is thick and egg-shaped with a curved sac and rounded callus. Flowering occurs sporadically.

The sepal and petals are about long and wide. The labellum is about long and wide with three lobes. The side lobes are erect and the middle lobe triangular with three ridges. Flowering occurs from August to October.

The lateral sepals are linear to thread-like, long and wide. The petals are long and about wide. The labellum is long and about wide and fleshy with tufts of red bristles. Flowering occurs from March to May.

Although the flowers are similar, Miltoniopsis differs from Miltonia by having one leaf to each pseudobulb, and a lobed column that is united to the labellum through a keel. In addition, the column is not concave at the base.

Prasophyllum fimbria was first formally described in 1871 by Heinrich Reichenbach and the description was published in Beitrage zur Systematischen Pflanzenkunde. The specific epithet (fimbria) is a Latin word meaning "fringe" referring to the frilly edges of the labellum.

The dorsal sepal and petals form a hood or "galea" over the column, the lateral sepals turn downwards and the labellum is insect-like with two long bristles on the "head" end. Flowering occurs between late August and October.

The sepals are oblong to egg-shaped and spread widely and the petals are usually narrower than the sepals. The labellum is relatively short with three lobes, the middle lobe tongue-like and the side lobes shorter and broad.

The petals are a similar length to the sepals but narrower. The labellum has three thread-like lobes long with the side lobes curving upwards. The nectary spur is long and slightly curved. Flowering occurs between January and April.

The lateral sepals are turned downwards, joined near their bases with tapering tips long. The labellum long, bearded with bright yellow hairs up to long and ending in a dark brown knob. The flowers appear from September to November.

Sarcochilus argochilus, commonly known as the northern lawyer orchid, is a small epiphytic orchid endemic to Queensland. It has up to eight thin leaves and up to twelve small bright green to yellowish green flowers with a white labellum.

The labellum is white with rose-coloured spots, about long and wide three lobes. The side lobes are triangular and the middle lobe is fleshy with a spur and a large, fleshy callus. Flowering occurs from April to August.

Pterostylis allantoidea was first formally described in 1940 by Richard Sanders Rogers in Transactions of the Royal Society of South Australia. The specific epithet (allantoidea) is from the Latin allantoideus, 'sausage-shaped', referring to the shape of the labellum.

Glands on the labellum emit pheromones which are sexual attractants for male thynnid wasps. Flowering occurs in spring in most species and is followed by the fruit which is a non-fleshy, dehiscent capsule containing up to 500 seeds.

They are shallowly dished, densely hairy on their outer edges and suddenly taper to a thread-like tip, . The labellum is dark reddish-brown, thin and insect-like, long and wide and hairy. Flowering occurs from October to December.

The sepals are fleshy, long, about wide and have pointed tips. The petals are also fleshy, about long and wide. The labellum is fleshy and curved in a semicircle, about long and wide. Flowering occurs from August to October.

The sepals and petals are fleshy, the sepals long, about wide and the petals about long and wide. The labellum is brown, about long and wide with a sharp bend near the middle. Flowering occurs from March to August.

Arthrochilus laevicallus is a species of flowering plant in the orchid family (Orchidaceae) and is endemic to Papua New Guinea. It is leafless but has up to seven green, insect-like flowers with dark reddish glands on its labellum.

Polycladia (the other section of E. subg. Amphiglottium), which have truly paniculate inflorescences."Flores racemosi (raro in paniculam racemosam luxuriantes), labellum lobatum" H. G. Reichenbach "Orchides" in Carl Müller, Ed. Walpers. Annales Botanices Systematicae 6(1861)373 Berlin. p.

The lateral sepals are oblong, curved, long and about wide. The petals are linear, long and about wide. The lateral sepals and petals all turn downwards towards the ovary. The labellum is about long, wide with a reddish base.

The sepals are long and about wide, the petals shorter and narrower. The labellum is about long and wide, sometimes with faint pink markings with a triangular, crinkled middle lobe. Flowering occurs between August and May.Orchard, A.E. (ed.) (1994).

The lateral sepals have a thread-like tip long and there is a protruding, platform like sinus between their bases. The labellum is long, wide, brown, blunt and just visible behind the sinus. Flowering occurs from December to April.

The labellum is long and wide with three lobes. The middle lobe has a square tip and pimply surface and the side lobes curve upwards. Flowering occurs in November and December in Australia and March to September in Asia.

The labellum is white to cream-coloured, about long, wide with hairy side lobes and a blunt middle lobe. The middle lobe has a straight spur about long and the column is purple. Flowering occurs from October to December.

The lateral sepals are linear, about long and the petals are about long. The labellum is mostly hidden by the dorsal sepal but has edges which turn upwards and a few tiny bristles. Flowering occurs from June to August.

The petals are similar to the lateral sepals but . The labellum is dark red with a pale green to yellowish centre, about wide and folded lengthwise forming a groove along its centre line. Flowering occurs from October to December.

Chiloglottis truncata, commonly known as the small ant orchid, is a small species of orchid endemic to Queensland. It has two leaves and a single green flower with a shiny black, insect-like callus occupying most of the labellum.

The sepals and petals are hairy in some species but glabrous in others, and often have a small gland near their tips. The labellum is attached by a small hinge and in some species vibrates in the slightest breeze.

The petals are a similar size to the lateral sepals. The labellum has three thread-like lobes, the side lobes long and often twisted, the middle lobe long. The nectary spur is long. Flowering occurs from February to March.

Caladenia septuosa was first formally described in 1991 by David Jones and the description was published in Australian Orchid Research. The specific epithet (septuosa) is a Latin word meaning "obscure" referring to the small lateral lobes on the labellum.

The petals are about long, wide and turn inwards near their tip. The labellum is white with a yellow patch, about long, wide with inrolled edges and a deep pouch at its base. Flowering occurs from July to October.

The labellum is orange and white, about long and wide with three lobes. The side lobes are about erect, about long and wide and the middle lobe is short and fleshy with a spur about long. Flowering occurs sporadically.

The sinus between the lateral sepals bulges slightly and has a small V-shaped notch in the centre. The labellum is dark green, erect near its base then suddenly curves and protrudes above the sinus. Flowering occurs from September to January.

Pterostylis ophioglossa, commonly known as the snake-tongue greenhood, is a species of orchid endemic to eastern Australia. It has a rosette of leaves at the base and a single dull green, white and brown flower with a deeply notched labellum.

Aspasia psittacina is the only species found in Ecuador. It is vegetatively close to A. epidendroides, with large elliptic and highly flat pseudobulbs, it shows the same colors of the later, but has narrower flowers with the labellum proportionally much smaller.

Caladenia ornata, commonly known as ornate pink fingers is a species of orchid endemic to Victoria. It has a single leaf and one or two bright pink flowers with greenish-pink backs, and a dark pink labellum with dark red bars.

Chiloglottis jeanesii, commonly known as the mountain bird orchid, is a species of orchid endemic to Victoria. It has two broad leaves and a single green to dark purplish brown flower with shiny black, column-like calli on the labellum.

The dorsal sepal is erect and about long, wide. The lateral sepals are about long, wide and curl downwards. The petals are about long, wide and face forwards. The labellum is thin, long, wide with irregular edges and a small callus.

Caladenia nobilis, commonly known as the noble spider orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single hairy leaf and one or two large white flowers with a red-marked labellum.

The sepals are long, about wide and the petals are about long and wide with a red stripe along the midline. The labellum is about long and wide with a groove along its midline. Flowering occurs from April to September.

Caladenia discoidea was first described by John Lindley in 1840 in A Sketch of the Vegetation of the Swan River Colony. The specific epithet is "from the Latin discoideus (rounded blade and thickened margin), alluding to the rounded labellum shape".

The sinus between the bases of the lateral sepals bulges forward and has a small notch in the centre. The labellum is about 4 mm long, 1.5 mm wide and barely visible above the sinus. Flowering occurs from February to May.

The petals are about long and wide. The labellum is white, about long and wide with three lobes and a red anther. The side lobes are triangular and the middle lobe is short and rounded. Flowering occurs from September to December.

The petals are long and about wide. The labellum is fleshy and about long and has three lobes. The side lobes are erect and hairy and the middle lobe is short, thick and densely hairy. Flowering occurs between October and March.

The flowers are whitish with orange or yellow tips. The sepals are fleshy, long, about wide and the petals about long and wide. The labellum is about long and less than wide and fleshy. Flowering occurs from July to September.

The petals droop with long hairs on the tip, long and about wide . The labellum is white to cream-coloured, fleshy, curved, about long and wide with a groove along its midline. Flowering occurs between August and March in Australia.

There are two or three irregular rows of calli along the midline of the labellum. Plants appear with the first rains of the wet season and flowers from November to March in Australia and from April to May in China.

The petals are shorter than the lateral sepals and are mostly enclosed by the dorsal sepal. The labellum is oblong, up to long and curves downwards to be more or less parallel to the ovary. Flowering occurs from December to March.

The sepals and petals are fleshy, the sepals long, wide and the petals about long and wide. The labellum is brown, about long and wide with hairy edges and a sharp bend near the middle. Flowering occurs from March to August.

The lateral sepals are egg-shaped and curved, long and wide and the petals are oblong to egg-shaped, long and wide. The labellum is pink, egg-shaped, thick and fleshy, about long and wide. Flowering occurs between July and September.

The dorsal sepal is long, wide and the lateral sepals are long and wide. The petals are about long and wide. The labellum is pink to red, oblong, about long, wide, fleshy and curved. Flowering occurs from September to November.

The lateral sepals are lance-shaped, long, about wide. The petals are linear, about long and wide. The lateral sepals and petals are turned back against the ovary. The labellum is about long, wide on a stalk or "claw" about long.

There are many densely crowded, dark purplish, finger-like "calli" crowded in distinct rows in the central part of the labellum. Flowering occurs from August to September. The fruit is a non-fleshy, dehiscent capsule containing a large number of seeds.

The petals are similar in size and shape to the lateral sepals and curve downwards. The labellum is oblong, long and about wide and shelf-like with a few serrations near its pointed tip. Flowering occurs from May to October.

The side lobes are linear to narrow egg-shaped, long and about wide. There are two ridge-like calli about long near the base of the mid-line of the base of the labellum. Flowering occurs in September and October.

The flowers are long, wide. The lateral sepals turn downwards and have a tapering tip, long, wide. The labellum is about long, wide, pale green and hairy with a dark stripe along its mid-line. Flowering occurs from April to September.

The sepals and petals spread widely apart from each other. The labellum is long, about wide with two parallel orange or yellow ridges along its mid-line and a deep channel at its base. Flowering occurs between February and July.

One of the six petal-like tepals named the labellum (a little lip), is specialised, being enlarged and hanging protectively over the reproductive organs. It was discovered in New Guinea in 1875, but has since been sighted in Queensland, Australia.

The lateral sepals are held close to the galea, almost closing the front of the flower and have erect, thread-like tips long. The labellum is broad but not visible from outside the flower. Flowering occurs in June and July.

The lateral sepals are held close to the galea almost closing the front of the flower and have erect, thread-like tips long. The labellum is broad but not visible from outside the flower. Flowering occurs in June and July.

The rest of the labellum (representing the female "body" of the insect) is light green on the upper half, with a few scattered dark spots while the lower half is dark maroon. Flowers appear from late September to early November.

There are two rows of stalked calli with yellow heads along the mid-line of the labellum. Flowering occurs from September to November but the flowers are only open for a day or two, sometimes barely open and are self-pollinating.

The lateral sepals are held close to the galea almost closing the front of the flower and have erect, thread-like tips long. The labellum is large but not visible from outside the flower. Flowering occurs from August to early December.

The flowers in some species are small but others have large, showy flowers in a wide range of colours. The sepals are usually larger than the petals but the labellum has three lobes and a spur or pouch at its base.

Drakaea concolor was first formally described by Stephen Hopper and Andrew Brown in 2007. Their description was published in Australian Systematic Botany. The specific epithet is from the Latin concolor and alludes to the uniform dark colour of the labellum.

The labellum is white, long and wide with three lobes. The side lobes are erect and curved and the middle lobe is about long with a notched tip and a spur about long. Flowering mainly occurs from November to March.

The sepals are long and about wide, the petals a similar length but narrower. The labellum is long and wide with two green calli near its base and two orange ridges along its midline. Flowering occurs between July and September.

The side lobes are linear to oblong, erect, about long and wide. There are two parallel ridge-like calli about long near the base of the mid-line of the base of the labellum. Flowering occurs from July to September.

The dorsal sepal is about long and wide, the lateral sepals about long and wide. The petals are shorter and narrower than the dorsal sepal. The labellum is long and about wide and curves downwards. Flowering occurs between April and June.

The dorsal sepal is about long and wide, the lateral sepals slightly narrower and the petals shorter and only about wide. The labellum is about long and wide with pimply edges and a triangular tip. Flowering occurs between January and April.

The labellum is white, green or yellowish, sometimes with purple markings, about long, wide with three lobes. The side lobes are long and narrow and the middle lobe is warty with a spur long. Flowering occurs from September to October.

The labellum is white with yellow markings, about long and wide with three lobes. The side lobes have a beak-like front and the middle lobe is short and thickened with a spur long. Flowering occurs from August to October.

Orchids in the genus Chiloschista are epiphytic or lithophytic, usually leafless Monopodial herbs with flat, green, photosynthetic roots radiating from a short, central rhizome. The flowers are arranged on long, thin flowering stems, open sporadically in groups and only last for a few hours to one or two days. They are small and resupinate, with the sepals and petals more or less similar in size and shape to each other but different from the labellum which has three lobes. The side lobes of the labellum are erect and larger than the middle lobe which is slipper-shaped.

The lateral sepals are 28–40 mm long and about 4 mm wide and parallel to each other, held horizontally or turned slightly downwards. The petals are 20–25 mm long, about 2 mm wide and arranged like the lateral sepals. The labellum is pale green and white, 12–15 mm long, 13–16 mm wide with a red tip. The sides of the labellum have thin green teeth up to 3 mm long, the tip is curved downwards and there are four rows of dark red calli up to about 3 mm long, along its mid-line.

The lateral sepals have similar dimensions to the dorsal sepal and turn downwards, nearly parallel to each other and have drooping tips. The petals are 25–30 mm long, about 2 mm wide and turn downwards with drooping tips. The labellum is 16–18 mm long, about 9 mm wide, cream-coloured with a prominent, rosy-red tip which projects forward before turning downwards. The sides of the labellum have dark red teeth up to about 2 mm long and there are four rows of dark red calli up to about 1 mm long along its mid- line.

The lateral sepals are 60–100 mm long, 4–8 mm wide, spread apart from each other and have drooping tips. The petals are 50–80 mm long, 3–6 mm wide and also have drooping tips. The labellum is white or cream- coloured with its tip rolled under and sides turned upwards. There are many thin, reddish teeth up to 3.5 mm long on the side of the labellum and four or six rows of narrow, reddish foot-shaped calli up to 2 mm long along its mid- line with the longest ones near its base.

The lateral sepals are 40–50 mm wide, 3–7 mm long and spread apart from each other with their tips curving downwards. The petals are 35–40 mm long, about 3 mm wide and held horizontally or slightly curved downwards. The labellum is 17–22 mm long, 10–14 mm wide and greenish-yellow with red lines and a dark red tip. The side of the labellum have narrow, red teeth up to 4 mm long, the tip curls under and there are four rows of dark red calli up to 1.5 mm long, along its mid-line.

The two species however differ in respect to the spathulate to linear petals which are shorter than sepals, fused only at the base and present inside the perianth tube; the labellum are elongate-elliptic and column broadest in the middle part in G. spatulata, whereas the petals as long as sepals with apical 1/3rd part free (rest fused with sepals) and reflexed backwards, labellum rhomboid in shape, column broadest towards the apex in G. gunatillekeorum. The only other Gastrodia species known from Sri Lanka is G. zeylanica, a taller species without any yellow colouration in its dull white flowers.

The lateral sepals are long, about wide, linear to narrow lance-shaped, with a tip long and project forwards, either obliquely, parallel or crossed. The petals are translucent with a red strip in the centre and are long, about wide, linear to egg-shaped and point backwards towards the ovary. The labellum is wide, wide, heart-shaped to elliptic when flattened, slightly dished near the base with the edges rolled under but lacking teeth. The thick, fleshy callus covers most of the upper surface of the labellum and sometimes has many small pimple-like papillae on the outer half.

Drakaea thynniphila is similar to others in the genus in that it has a single, ground hugging leaf and an underground tuber. In this case, the leaf is heart shaped, about in diameter, covered with tiny raised lumps, fairly glossy dark green with darker lines radiating from the attachment to the stem. The stem is long and the stalk of the single flower is long. Its flower is also similar to those of other hammer orchids in that the labellum resembles a flightless female thynnid wasp, except that the labellum is longer, less swollen than those of other drakaeas and lacks spots.

The lateral sepals are linear to lance-shaped, long, about wide, greenish-brown and free from each other. The petals are linear to lance-shaped with the narrower end towards the base, long, about wide and white with greenish or purplish markings. The labellum is white, narrow lance-shaped with the narrower end towards the base, long, about wide and turns sharply upwards near its middle, reaching to the lateral sepals or higher. The edges of the upturned part of the labellum are slightly wavy and there is a fleshy green, channelled callus in its centre.

It is usually dull- to pinkish red, sometimes cream or yellow with prominent dull red markings. The arching lateral sepals and petals are similar in size, shape and colour to the dorsal sepal although the petals are slightly narrower and shorter. The labellum is white with red markings, and curves forward with white to pale red teeth along its margins, the teeth decreasing in size towards the tip. There are up to 13 pairs of anvil-shaped, cream-coloured calli in two rows along about half the length of the labellum and decreasing in size towards the tip.

The labellum may be entirely free or partially fused to the column forming a nectary. The column is stout and darker than the rest of the flower and may have four or eight pollinia.Van den Berg, Cássio (2006). Isabelia in Genera Orchidacearum Vol.

Secretaria de Agricultura de São Paulo. The flower color and shape are remarkably constant in this species and just a few alba form specimens have been collected since it was discovered. It has a free labellum and eight pollinia.Withner, Carl Leslie (1990).

Chiloglottis longiclavata, commonly known as the northern wasp orchid, is a species of orchid endemic to Queensland. It has two leaves and a single narrow, pinkish green flower with a dark blackish red callus covering most of the upper surface of the labellum .

Chiloglottis triceratops was first formally described in 1998 by David Jones and the description was published in Australian Orchid Research. The specific epithet (triceratops) refers to the similarity between the dinosaur Triceratops and the tall calli on the labellum of this orchid.

The petals are about long and wide. The labellum turns downwards and has three lobes, the side lobes very narrow linear to thread-like, long and the middle lobe long. The nectary spur is curved and long. Flowering occurs in January and February.

Habenaria elongata was first formally described in 1810 by Robert Brown and the description was published in Prodromus Florae Novae Hollandiae et Insulae Van Diemen. The specific epithet (elongata) is a Latin word meaning "prolonged", referring to the three long labellum lobes.

The name Appendicula is the diminutive form of the Latin word appendix meaning "appendage" or "addition", hence "little appendage", referring to the "inward-facing appendages on the labellum". Orchids in the genus Appendicula occur from tropical and subtropical Asia to the western Pacific.

Peristylus chlorandrellus, commonly known as the green ogre orchid, is a species of orchid that is endemic to north-eastern Queensland. It has between four and seven leaves near its base and up to thirty six green flowers with a three-lobed labellum.

Habenaria propinquior, commonly known as the common rein orchid, is a species of orchid that is endemic to north Queensland. It has two to four leaves at its base and up to thirty white flowers with thread-like lobes on the labellum.

The dorsal sepal is erect, long and wide. The lateral sepals are long and wide and curve stiffly downwards. The petals are long, wide and curve upwards. The labellum is long, wide and greenish-yellow with a glossy red tip which curls downwards.

Pterostylis stricta, commonly known as the northern greenhood, is a species of orchid endemic to Queensland. It has a rosette of leaves and when flowering a single translucent white flower with green lines, a reddish-brown tip and a curved, protruding labellum.

The labellum is whitish, long, wide, is covered with short hairs and has three lobes. The side lobes are triangular and upright and the middle lobe is very wavy with three dark red ridges along its midline. Flowering occurs from December to January.

The sepals are long, wide and are relatively think and fleshy. The petals are long, wide. The labellum is long, wide and has three lobes. The side lobes curve upwards and the middle lobe is kidney-shaped and has three wavy ridges.

At the end of the tube the petals form three lobes, long. Inside the petals are three petal-like structures (staminodes). The two side staminodes are upright. The lip or labellum is bent downwards and is divided into two at the tip.

Caladenia xantha, commonly known as the primrose spider orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single erect, hairy leaf and up to three yellow flowers with a cream-coloured, brown- striped labellum.

Sarcochilus borealis, commonly known as the small lawyer orchid, is a small epiphytic orchid endemic to Queensland. It has up to six thin but stiff, dark green leaves and up to ten green flowers with a white labellum that has reddish brown markings.

The sepals and petals curve inwards. The dorsal sepal is narrow triangular, long and wide and the lateral sepals are a similar length but wide. The petals are long and wide. The labellum is fleshy, curved, long and about wide with tiny spots.

The dorsal sepal has a long-tapering, down-curved tip. The lateral sepals turn backwards and away from each other. The labellum is curved, dark green, reddish near the tip and arched along its mid-line. Flowering occurs from November to January.

The lateral sepals are erect, held closely against the galea with thread-like tips about 3mm long reaching just past the top of the galea. The labellum is about long, wide, dark brown and white, curved and barely visible above the sinus.

The petals are long and wide. The labellum is about long, wide and has three lobes. The side lobes are curve upwards and the middle lobe has two ridges on its midline and two forward projecting flanges. Flowering occurs from July to November.

The centre lobe is a broad wedge shape, often with irregular edges. The lateral lobes are small and oblong with toothed edges. There are two ridge-like calli about long near the mid-line of the labellum. Flowering occurs from September to November.

The lateral sepals are held closely against the galea, fused at their bases and almost closing the front of the flower with erect tips long. The labellum is small, narrow and not visible from outside the flower. Flowering occurs from August to September.

The lateral sepals are erect with a small gap between them and the galea and have thread- like ends long. The labellum is long, narrow and down-curved, protruding prominently above the sinus between the lateral sepals. Flowering occurs from May to August.

Arthrochilus prolixus was first formally described in 1991 by David Jones from a specimen collected near Wauchope. The description was published in Australian Orchid Research. The specific epithet (prolixus) is a Latin word meaning "stretched out long", referring to the long labellum calli.

The petals are elliptic in shape, long and about wide. The labellum is long, wide, has deep purplish red veins and three lobes. The middle lobe turns downwards and is wavy but the side lobes are upright. Flowering occurs between July and November.

Corybas dowlingii, commonly known as red lanterns, is a rare species of terrestrial orchid endemic to New South Wales. It grows in colonies and has a round or heart-shaped leaf and a dark purplish red flower with white patches in the labellum.

Prasophyllum triangulare was first formally described in 1882 by Robert D. FitzGerald and the description was published in The Gardeners' Chronicle. The specific epithet (triangulare) is derived from a Latin word triangulus meaning "triangular" referring to the narrow, triangular shape of the labellum.

Corybas incurvus was first formally described in 1988 by David Jones and Mark Clements from a specimen collected near Tyabb and the description was published in the Kew Bulletin. The specific epithet (incurvus) refers to the in-turned edges of the labellum.

The edges of the upturned part are wavy or crinkled with hair-like papillae. There is a raised, claw-like, yellowish brown callus in the centre of the labellum and extending almost to its tip. Flowering occurs in late September and early October.

The edges of the upturned part are wavy or crinkled with short, hair-like papillae. There is a raised, greenish-yellow callus in the centre of the labellum and extending almost to its tip. Flowering occurs from late September to mid-October.

The petals are a similar shape but slightly curved, long, about , free from each other and the sepals. The labellum is dark pink and projects forwards, long, wide with an upturned tip and a narrow central band of mauve hairs up to long.

The labellum has 2 to 4 rows of calli with large heads. The column is erect with wide wings and pink markings. The species flowers from August to November, much more prolifically after recent bushfires, and delayed in some places until after rainfall.

Caladenia incrassata, commonly known as the puppet clown orchid is a species of orchid endemic to the south-west of Western Australia. It has a single, hairy leaf and usually only one greenish-yellow and red flower which has a red-striped labellum.

The petals are long and about wide. The labellum is erect and curved, about long and wide with three lobes. The side lobes are large and erect and the middle lobe is short and turns downwards. Flowering occurs from October to December.

There are usually four rows of pale red calli up to long in the centre of the labellum. Flowering occurs from late July to August. This subspecies is most similar to subspecies borealis but has smaller flowers and a more easterly distribution.

Garay and Taylor noted that structure of the labellum is unique in the genus and resembles that of an Asian genus of orchids, Grosourdya. The spur is longer than the midlobe of the labellum.Garay, L.A., and P. Taylor. 1976. The genus Oeceoclades Lindl.

The sepal and petals are about long and wide. The labellum is about long and wide with three lobes. The side lobes are erect and the middle lobe turns downward with two ridges near the base. Flowering occurs from August to October.

The three- lobed forward-projecting labellum is white with purple markings and has a tuft of white hairs. Tubers usually produce only a single flower spike. Flower spikes from an individual plant may appear as infrequently as once in a five- year period.

The petals are narrow spatula-shaped, long, about wide and held close to the dorsal sepal. The labellum is long, about wide and has three lobes. The middle lobe is long and is fleshy with red bristles. Flowering occurs from July to September.

Prasophyllum lindleyanum, commonly known as the green leek orchid, is a species of orchid endemic to south-eastern Australia. It has a single smooth, tube-shaped leaf and up to twenty scented, greenish flowers with a greenish or white labellum with a pink tinge.

Garay, L.A., and P. Taylor. 1976. The genus Oeceoclades Lindl. Botanical Museum Leaflets, Harvard University 24(9): 249-274. Garay and Taylor noted that among all the species in the genus Oeceoclades, this one is unique in possessing a forward- projecting spur under the labellum.

There is a wide gap between the petals and the lateral sepals and the sinus between the lateral sepals has a central notch and curves slightly forward. The labellum is long, about wide, and is brown and blunt. Flowering occurs from July to September.

Chiloglottis triceratops, commonly known as the three-horned bird orchid, is a species of orchid endemic to Tasmania. It has two broad leaves and a greenish brown to purplish brown flower with a few column-like calli near the mid-line of the labellum.

It is sometimes hinged to the column, or otherwise fused to it. The labellum has three lobes, the side lobes erect, sometimes surrounding the column and the middle lobe often curving downwards. After pollination a glabrous capsule containing many light coloured seeds is produced.

The petals are about long and wide. The labellum is shaped like a trident, long, wide with three lobes. The side lobes are about long and the middle lobe is about long. The nectary spur is white with a greenish tip, long and about wide.

Caladenia oreophila is a plant in the orchid family Orchidaceae and is endemic to south-eastern Australia. It is a ground orchid with a single leaf and a single greenish-cream flower with pale red stripes a red labellum with a greenish-cream base.

The lateral sepals are held closely against the galea, have erect thread-like tips long and a protruding, V-shaped sinus between their bases. The labellum is about long and about wide, blackish, blunt and protruding above the sinus. Flowering occurs from April to August.

Caladenia integra, commonly known as the smooth-lipped spider orchid is a species of plant in the orchid family, Orchidaceae and is endemic to the south-west of Western Australia. It can be distinguished by its distinctive smooth-edged labellum and its upswept lateral sepals.

The lateral sepals are long, wide and curl downwards. The petals are long, wide and are held under the dorsal sepal. The labellum is oblong, long, wide and turns downwards with thickened, irregular edges and a prominently cleft tip. Flowering occurs from September to November.

The galea is long and wide with the dorsal sepal slightly longer than the petals. The lateral sepals are downturned and joined together. The labellum is short, broad and blunt with a dark green lobe on the upper end. Flowering occurs from October to January.

The side staminodes are upright. The broad central lip or labellum is bent downwards. It has a narrowed section (claw) at its base which is joined to the side lobes of the petal tube. There is a single stamen with a short upright filament.

Gastrodia lacista was first formally described in 1991 by David Jones from a specimen collected near Albany in 1989. The description was published in Australian Orchid Research. The specific epithet (lacista) is a Latin word meaning "torn" referring to the edges of the labellum.

Cryptostylis hunteriana, commonly known as the leafless tongue-orchid is a flowering plant in the orchid family Orchidaceae and is endemic to south eastern Australia. It is leafless but has up to ten green flowers with a more or less erect, dark reddish brown labellum.

The flowers are long, and are fragrant. The sepals and petals are fleshy, oblong to egg-shaped, long and about wide. The labellum is yellow, about long and wide with three lobes. The middle lobe is fleshy, about long with a downturned spur about long.

The sepals are narrow triangular in shape, long, the lateral sepals joined at their sides for about half their length. The petals are much shorter than the sepals. The labellum is orange with a sharp bend near the middle. Flowering occurs from October to November.

In insect and mammalian taste, receptor cells changes into attractive or aversive stimulus. The number of taste receptors in a mammalian tongue and on the tongue of the fly (labellum) is same in amount. Most of the receptors are dedicated to detect repulsive ligand.

Sarcochilus parviflorus, commonly known as the southern lawyer orchid or green tree orchid, is an epiphytic orchid endemic to eastern Australia. It has up to eight rigid leaves and up to twelve small bright green to yellowish green flowers with reddish markings on the labellum.

Each flower has a pedicel long, including the ovary. The sepals are long, about wide and the petals are a similar length but only about wide. The labellum is long, wide and turns downward and backward on itself. Flowering occurs between February and June.

Its sides spread widely or turn upwards and have many erect to spreading teeth up to long and there are six or eight rows of red calli clustered in the centre of the labellum. Flowering is from late September to November.Side view of C. lobata.

Cyrtostylis oblonga, commonly known as the winter orchid or gnat orchid, is a species of orchid endemic to New Zealand. It has a single rounded leaf and a flowering stem with up to four pink or pinkish green flowers with a flat, oblong labellum.

The labellum is up to long with its end covered with many branched lobes covered with tiny cilia. Flowering occurs from June to October following which the flowering stem elongates greatly, with the fruiting capsule on the end up to above the litter layer.

The sepals are about long and wide, the petals a similar length but narrower. The labellum is similar to the petals in size and shape but curved. Flowering occurs between August and October but the flowers are self-pollinating and do not open widely.

The lateral sepals are linear, about long and usually joined to each other. The petals are linear and about long. The labellum is about long with a transparent central mound and has many long, narrow teeth on the edges. Flowering occurs from May to August.

Cyrtostylis robusta, commonly known as large gnat-orchid or mosquito orchid, is a species of orchid endemic to southern Australia. It usually has a single more or less round leaf and a flowering spike with up to seven reddish flowers with a shelf-like labellum.

The petals are also a similar length but only about wide. The labellum is egg-shaped with the narrower end towards the base, a channelled base and irregular edges. It is long and wide and has a green column. Flowering occurs between October and December.

The sepals are long, wide and the petals are a similar length but wider. The labellum is pink with dark red veins, long and wide with the sides curved upwards. Flowering occurs between December and February in Australia and between June and July in Asia.

The flowers are wide on a pedicel long. The sepals and petals are long, wide and all are free from each other with their tips curved slightly forwards. The labellum is long, wide with a narrow central band of mauve hairs up to long.

Prasophyllum constrictum was first formally described in 1909 by Richard Sanders Rogers from a specimen collected near Tailem Bend and the description was published in Transactions, proceedings and report, Royal Society of South Australia. The specific epithet (constrictum) refers to the constriction of the labellum.

There are four or more rows of pink calli along the centre of the labellum. Flowering occurs from November to early December. This subspecies is similar to subspecies pholcoidea but has shorter lateral sepals and petals, whiter flowers and a slightly earlier flowering period.

The petals are similar to the sepals or very narrow. The labellum is adnate to the column to its apex with completely erect lamina, either trilobate or lacking any divisions. The column is short with a dilated margin. The clinandrium is short and truncated.

Sarcochilus dilatatus, commonly known as the brown butterfly orchid, is a small epiphytic orchid endemic to eastern Australia. It has up to twelve, thin, leathery, dark green leaves and up to twelve brown or reddish brown flowers with a mostly white and yellow labellum.

Caladenia cairnsiana, commonly known as the zebra orchid, is a species of orchid endemic to the south-west of Western Australia. It is a common and widespread orchid distinguished by its red-striped labellum, and petals and lateral which are pressed against the ovary.

Sarcochilus hillii, commonly known as myrtle bells, is a small epiphytic orchid native to eastern Australia and New Caledonia. It has up to ten drooping, quill-shaped leaves and up to ten frosty white or pink flowers that have a hairy labellum with purple stripes.

Sarcochilus serrulatus, commonly known as the banded butterfly orchid, is an epiphytic orchid endemic to tropical North Queensland. It has up to six crowded leaves with finely toothed and wavy edges and up to ten reddish brown flowers with a white, yellow-banded labellum.

There are two rows of thick calli along the centre of the labellum. Flowering occurs from July to early October. In areas of high rainfall it tends to only flower after fire but in drier areas it flowers in the absence of summer fires.

Oeceoclades pandurata is distinguishable from other species in the genus by the lateral lobes of the labellum, which are free and truncate (an abrupt termination).Garay, L.A., and P. Taylor. 1976. The genus Oeceoclades Lindl. Botanical Museum Leaflets, Harvard University 24(9): 249-274.

The sides of the labellum have short, broad, forward-facing serrations, its tip is curled under and there are two rows of anvil-shaped calli up to long, along its centre. Flowering occurs from August to early September and is encouraged by good winter rainfall.

Caladenia infundibularis was first formally described by Alex George in 1984 and the description was published in Nuytsia from a specimen found near Augusta. The specific epithet (infundibularis) is a Latin word meaning "funnel-shaped", referring to the shape of the base of the labellum.

The sepals and petals are about long and wide. The labellum is about long and wide with three lobes. The side lobes are erect, fleshy and triangular and the middle lobe is about long with a spur about long. Flowering occurs from March to July.

Caladenia sigmoidea, commonly known as the sigmoid spider orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single erect, hairy leaf and usually only one red and cream-coloured flowers with an unusual S-shaped labellum.

Garay and Taylor noted that O. saundersiana has a labellum with four lobes of equal size and the pseudobulb is long and cylindrical with two leaves.Garay, L.A., and P. Taylor. 1976. The genus Oeceoclades Lindl. Botanical Museum Leaflets, Harvard University 24(9): 249-274.

The lateral sepals are joined to each other and the relatively short petals face forwards. The labellum is white and narrowed near the middle, where it turns upwards through about 90°. The upturned part has a wavy edge. Flowering occurs from August to October.

There are white to deep red calli along the edges of the labellum and four to six rows of calli shaped like hockey sticks in its central part. Flowering occurs from late October to mid-November and is stimulated by bushfire in the previous summer.

The petals are erect, egg-shaped to elliptic, long and wide on a reddish brown stalk long. The labellum is long and has three lobes. The centre lobe is wedge-shaped, long and wide and folded lengthwise. The side lobes are long and about wide.

Caladenia cucullata, commonly known as the hooded caladenia, is a plant in the orchid family Orchidaceae and is endemic to south-eastern Australia. It is a ground orchid with a single, sparsely hairy leaf, and up to seven white flowers with a purplish labellum.

The sepals are broad egg-shaped, about long and the labellum has three lobes. The middle lobe is long and the side lobes are small. The species is usually found in shady places in the undergrowth of forests and is found in the Eastern Ghats.

Inside the petals are structures formed from four sterile stamens (staminodes): two lateral staminodes form what appear to be small upright petals, which are 1.1–2.2 cm by 0.8–1.3 cm, with a central vein; two central staminodes are partially fused at the base to form a large lip or labellum, 4.5–5.5 cm long by about 3.5–4.5 cm wide. The labellum is split into two lobes at the end for about a quarter of its length. The single functional stamen has a cream anther, about 6–8 mm long, with 6 mm long spurs formed from the connective tissue between the two capsules of the anther.

The labellum divides to form two separated lobes, each 2.2–2.4 cm long at the central edge, shorter at the outer edge. Two or three white lines extend from the base of each lobe, sometimes more than halfway to its finely toothed (serrulate) apex. The single functional stamen has a white anther, about 5–6 mm long, with 2–3 mm long spurs, formed from the connective tissue between the two capsules of the anther. The species resembles R. tibetica, but the leaf blades are smaller, the corolla tubes much longer, exceeding the calyx, and the labellum is differently shaped and has white lines at the base.

The dorsal sepal is erect near its base then curves forward and is 40–70 mm long and about 2 mm wide. The lateral sepals and petals have the same dimensions as the dorsal sepal but spread apart from each other, horizontally near their base but then curve downwards, drooping near the tips. The labellum is 7–10 mm long, 5–8 mm wide and creamy-white to pale yellow with red lines and spots and short, blunt teeth on its sides. There are two rows of cream-coloured, narrow anvil-shaped calli up to 1.5 mm long, along the centre of the labellum.

Dactylorhiza sambucina, Orchidoideae for referenceThe orchid flower, like most flowers of monocots, has two whorls of sterile elements. The outer whorl has three sepals and the inner whorl has three petals. The sepals are usually very similar to the petals (thus called tepals, 1), but may be completely distinct. The medial petal, called the labellum or lip (6), which is always modified and enlarged, is actually the upper medial petal; however, as the flower develops, the inferior ovary (7) or the pedicel usually rotates 180°, so that the labellum arrives at the lower part of the flower, thus becoming suitable to form a platform for pollinators.

Drakaea andrewsiae is only known from photographs and a few specimens of the flower and stem. Presumably it is similar to others in the genus in having a single, ground hugging leaf and an underground tuber. The stem is long and the stalk of the single flower is long. Its flower is also similar to those of other hammer orchids in that the labellum resembles a flightless female thynnid wasp however it can be distinguished by having a spine on the column, a labellum with an erect tip on the end of the "tail", and a "body" that is spotted and densely covered with hair.

Drakaea micrantha is similar to others in the genus in that it has a single, ground hugging leaf and an underground tuber. In this case, the leaf is heart shaped, about in diameter, silvery-grey dark green and rather glossy with darker green veins radiating from the leaf attachment. The stem is long and the stalk of the single flower is long. Its flower is also similar to those of other hammer orchids in that the labellum resembles a flightless female thynnid wasp however it can be distinguished by having a spine on the column, and a labellum with a straight end and a narrow "neck".

Genoplesium ostrinum, commonly known as the purple midge orchid is a small terrestrial orchid which is endemic to New South Wales. It has a single thin leaf and up to ten dark purple flowers with darker stripes and a hairy labellum which vibrates in the slightest breeze.

Genoplesium ruppii, commonly known as Rupp's midge orchid and as Corunastylis ruppii in Australia, is a small terrestrial orchid endemic to eastern Australia. It has a single thin leaf fused to the flowering stem and up to twenty five small, hairy green flowers with a purple labellum.

The lateral sepals are a similar size to the dorsal sepal and are usually free each other. The petals are linear to lance-shaped and long. The labellum is white, long, turns upwards at more than 90° and has crinkled edges. Flowering occurs from September to October.

Flower colour: Sepals and petals are pinkish-white to pale pink with five to seven pinkish-red stripes basally; labellum is pink, yellow and orange.Philippine Native Orchid Species pp. 106-107, J.Cootes 2011 It is the smallest-flowered member of the section Calcarifera from the Philippines.

Pterostylis melagramma was first formally described in 1998 by David Jones and the description was published in Australian Orchid Research. The specific epithet (melagramma) is derived from the Greek words melas, melanos meaning 'dark' or 'black' and gramme, 'line', referring to the dark stripe on the labellum.

The sinus between the bases of the lateral sepals almost closes off the front of the flower and has a small notch in the centre. The labellum is about long and wide and is not visible from outside the intact flower. Flowering occurs from March to May.

Pterostylis procera, commonly known as the short-lipped greenhood, is a species of orchid endemic to Queensland. It has a rosette of leaves and when flowering a single translucent white flower with green and reddish markings and a labellum which does not protrude through the lateral sepals.

Although there are no reports of flower pollination being directly observed, a paper published in 2006 studied the micromorphology of the labellum in Bifrenaria species, looking for substances useful to insects as food.Davies, K.L. & Stpiczynska, M. (2006). Labellar Micromorphology of Bifrenariinae Dressler (Orchidaceae). Annals of Botany Company.

Chiloglottis anaticeps was first formally described in 1991 by David Jones from a specimen collected west of Wauchope and the description was published in Australian Orchid Research. The specific epithet (anaticeps) refers to the stalked gland on the labellum which is shaped like a duck's head.

The dorsal sepal is erect, long and wide. The lateral sepals are long, wide and spread widely and stiffly but with drooping tips. The petals are long and about wide, and arranged like the lateral sepals. The labellum is long, wide and has its tip rolled under.

Henry Nicholas Ridley named this species in 1907 in the Material for a Flora of the Malay archipelago, under the genus Eria. This orchid species has been moved to Pinalia, but the taxonomy is under review. The species name xanthocheila refer to the bright yellow labellum.

Himantoglossum is a genus of orchids native to the Canary Islands, Europe, southwest Asia and northern Africa. Its members generally have a labellum which is divided into three parts, of which the middle part is the longest. The genera Comperia and Barlia are now included in Himantoglossum.

Habenaria euryloba, commonly known as the small rein orchid, is a species of orchid that is endemic to a small area in far north Queensland. It has two or three leaves at its base and up to twenty small white flowers with a trident- like labellum.

Habenaria fuscina, commonly known as the green rein orchid, is a species of orchid that is endemic to Cape York Peninsula. It has two or three leaves at its base and up to fifteen small green and white flowers with a labellum shaped like a trident.

The lateral sepals are a similar size to the dorsal sepal and spread widely apart from each other. The petals are long and about wide and are projected forwards. The labellum is long, wide with its tip divided into three. Flowering occurs from January to March.

The genus Tropidia was first formally described in 1833 by John Lindley and the description was published in Edwards's Botanical Register. The name Tropidia is derived from the Ancient Greek word tropidos meaning "keel", referring to the boat-shaped labellum of some species in this genus.

Habenaria harroldii, commonly known as the southern rein orchid, is a species of orchid that is endemic to the Fraser Coast region of Queensland. It has up to five leaves at its base and up to twenty five white flowers with reduced side lobes on the labellum.

Caleana alcockii, commonly known as Alcock's duck orchid is a rare species of orchid endemic to the south-west of Western Australia. It has a single smooth leaf and is distinguished by its humped labellum and relatively late flowering period. It only occurs north of Geraldton.

The little leek orchid was first formally described in 1840 by John Lindley and the description was published in A Sketch of the Vegetation of the Swan River Colony. The specific epithet (ovale) is a Latin word meaning "oval", referring to the shape of the labellum.

The sepals are oblong to egg-shaped, long and wide. The dorsal sepal is upright or turned back and the lateral sepals spread widely apart from each other. The petals are broadly egg-shaped, long and wide. The labellum is long, wide and has three lobes.

The lateral sepals are about long, wide with their tips rolled downwards. The petals are long, wide and are partly enclosed by the dorsal sepal. The labellum is heart-shaped, long, about wide and curves downwards with slightly wavy edges. Flowering occurs from August to October.

The labellum is white, about long and wide with three lobes. The side lobes are erect and the middle lobe turns downward and has wavy edges and three ridges along the midline. Flowering occurs throughout the year with flushes from August to November and February to June.

The sepals are long and about wide. The petals are lance-shaped, long and about wide with their tips twisted. The labellum is yellow, about long and wide and has three lobes. The side lobes are erect and the middle lobe is pointed with three ridges.

The lateral sepals turn downwards, have hairy edges and narrow tips up to long which are upturned and spread apart from each other. The labellum is fleshy, dark brown, about long and insect-like with long, silky hairs on its edges. Flowering occurs from August to November.

The petals are similar is size to the lateral sepals. The labellum is white, erect, about long and wide with three lobes. The side lobes are triangular and erect and the middle lobe curves downwards with a deep, sac-like spur. Flowering occurs from March to June.

Sarcochilus australis, commonly known as the butterfly orchid or Gunn's tree orchid, is a small epiphytic orchid endemic to eastern Australia. It has up to ten oblong, dark green leaves and up to fourteen small green to yellowish or brownish flowers with a mostly white labellum.

The sepal are long and wide with the lateral sepals spreading widely apart from each other. The petals are long and wide. The labellum is long, about wide and brown to almost black with a thick pouch at its base. Flowering occurs between December and January.

The lateral sepals are held closely against the galea, have erect thread-like tips long and a flat, protruding, U-shaped sinus between their bases. The labellum is long, about wide, curved, dark brown and just visible above the sinus. Flowering occurs from April to July.

The lateral sepals are broadly egg-shaped, turn downwards and are long and wide. They are joined at their bases and their edges are rolled inwards. The labellum is about long and wide, pale green with a dark green appendage. Flowering occurs from October to January.

The lateral sepals and petals are about long and wide with the lateral sepals spreading apart from each other. The labellum is white with a yellow centre, about long, wide with two lobes on the end that have wavy edges. Flowering occurs from July to September.

The lateral sepals are long and wide and spread widely apart from each other. The petals are long, about wide with a dark blotch on the tip. The labellum is long, about wide with a red base and a yellow tip. Flowering occurs sporadically throughout the year.

The flowers are whitish to reddish with broad dark red stripes and have a pimply or hairy ovary. The sepals are long and wide, the petals about long and wide. The labellum is red, about long and wide, curved and fleshy. Flowering occurs from October to November.

Dactylorhiza majalis subsp. traunsteinerioides grows to tall, occasionally up to . Its leaves are at most wide, usually notably less, and may or may not be spotted. The flowers have a lip or labellum long by wide, usually three-lobed but always with a distinct central "point".

Caladenia lobata, commonly known as the butterfly orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single, hairy leaf and one or two greenish-yellow flowers with red markings which have a labellum which vibrates in the slightest breeze.

Orchis anthropophora, the man orchid (formerly Aceras anthropophorum), is a European species of orchid whose flowers resemble a human figure. The head is formed by the petals and sepals, and the suspended torso and limbs by the lobes of the labellum. It usually grows in calcareous grassland.

The flowers are white, greenish, cream-coloured or pink, more or less tube-shaped and long. The sepals and petals are blunt, long and do not open widely. The labellum is about long, wide with a shiny, dark green tip. Flowering occurs from August to November.

The lateral sepals are linear, long and about wide. The petals are narrow linear, long and about wide and slightly curved. The petals and lateral sepals turn backwards against the ovary and are inconspicuous. The labellum is about long and wide and held above the flower.

The petals are curved linear, long and wide and curved. The petals and lateral sepals turn backwards against the ovary. The labellum is about long and and held above the flower. The callus is about long with its central part covered with short, bristly hair-like glands.

Caladeni × triangularis was first formally described 1827 by Richard Sanders Rogers from a specimen collected between Wagin and Narrogin. The description was published in Transactions and Proceedings of the Royal Society of South Australia. The epithet (triangularis) refers to the shape of the labellum of this orchid.

Flora of China Vol. 24 Page 319 兰花蕉科 lan hua jiao ke Lowiaceae Ridley Orchidantha means "orchid- flower", as one of the petals on the flowers is modified into a labellum, like the flowers of orchids."Lowiaceae" . Smithsonian National Museum of Natural History.

The genus Eriochilus was first formally described in 1810 by Robert Brown and the description was published in Prodromus Florae Novae Hollandiae. The botanical name Eriochilus is derived from the Ancient Greek words ἔριον erion meaning "wool" and χεῖλος cheilos meaning lip referring to the hairy labellum.

Flowering occurs from December to March. This wasp orchid is similar to C. seminuda which has a callus covering only about two-thirds of the labellum. It is also similar to C. reflexa but has longer lateral sepals and a smaller "head" on the ant-like callus.

Chiloglottis trullata was first formally described in 1991 by David Jones from a specimen collected in the Blackdown Tableland National Park and the description was published in Australian Orchid Research. The specific epithet (trullata) is a Latin word meaning "trowel", referring to the shape of the labellum.

The dorsal sepal is long and about wide. The lateral sepals are long, about wide, free from and parallel to each other. The petals are long, about wide and curve forwards. The labellum is about long, wide and turns sharply upwards at about 90° near its middle.

The petals are erect, spread apart from each other, egg-shaped, long and wide on a brown stalk long. The labellum is long and has three lobes. The centre lobe is broadly egg-shaped, long and wide. The side lobes are long and wide with toothed edges.

HabitRosette leaves Pterostylis obtusa, commonly known as the blunt-tongue greenhood, is a species of orchid endemic to New South Wales. It is distinguished from similar greenhood orchids by its thick, flat, platform-like sinus and blunt labellum which is only just visible above the sinus.

The dorsal sepal is erect, long and wide at the base. The lateral sepals are long, wide and curve downwards from the horizontal. The petals are long, wide and also curve downwards. The labellum is long and wide and cream-coloured with red lines, and spots.

The labellum is long and wide and has three lobes. The side lobes are erect with purple stripes on the inside and the middle lobe is densely covered with white hairs. Flowering occurs between October and December but only up to three flowers are open at once.

The petals are long and about wide. The labellum is cream-coloured with purplish markings, about long with three lobes. The side lobes are erect, about long and curved inwards and the middle lobe has a rounded, fleshy spur about long. Flowering occurs between August and October.

The dorsal sepal is erect, long and wide. The lateral sepals are long and wide and curve stiffly downwards. The petals are long, wide and arranged like the lateral sepals. The labellum is long, wide and cream-coloured to yellow with red lines, spots and blotches.

The labellum is mustard-yellow with brownish-red stripes, projects prominently, has an irregularly serrated edge and two rows of shiny yellow calli along its centre. Flowering occurs between September and November and is followed by a non-fleshy, dehiscent capsule containing a large number of seeds.

Taeniophyllum lobatum was first formally described in 1956 by Alick Dockrill and the description was published in The Victorian Naturalist. The specific epithet (lobatum) is derived from the Latin word lobus meaning "an elongated projection or protuberance", referring to "the large lateral lobes of the labellum".

The dorsal sepal is long, wide and curves forward. The lateral sepals are long and wide, spread apart and curve downwards. The petals are long, about wide and arranged like the lateral sepals. The labellum is long and wide, green and white with a dark red tip.

The lateral sepals are long and about wide, the dorsal sepal slightly narrower. The petals are long and about wide. The labellum is long and wide with a more or less square-cut tip and three ridges along its midline. Flowering occurs between August and October.

The dorsal sepal is long and wide, the lateral sepals long and about wide. The petals are long and about wide. The labellum is about long and wide and concave with three lobes. The side lobes are erect and the midlobe is divided again into three lobes.

The lateral sepals are long, wide and turned downwards. The petals are more or less erect or bent backwards, long and wide on a greenish brown stalk long. The labellum is long and has three lobes. The centre lobe is diamond-shaped, wide and folded lengthwise.

The side lobes are long and wide and spread apart from each other. There are two, ridge-like calli long and outlined in brown along the mid-line of the labellum. Flowering occurs from October to December but much more prolifically after fire the previous summer.

The petals are curved backwards, broadly egg-shaped to almost circular, long and wide on a dark reddish brown stalk long. The labellum is long and has three lobes. The centre lobe is wedge-shaped, wide with a central ridge. The side lobes are long, wide.

The lateral sepals are long, wide and spread forwards. The petals are dull green with red tips and edges and are long and about wide. The labellum is long, about wide and has three lobes. The middle lobe is long and is fleshy with dark red bristles.

Pterostylis plumosa, commonly known as the bearded greenhood or plumed greenhood is a species of orchid in the family Orchidaceae which is endemic to south-eastern Australia and possibly New Zealand. Its labellum or lip is long and thin, bordered with golden hairs, giving it the name "bearded".

Garay, L.A., and P. Taylor. 1976. The genus Oeceoclades Lindl. Botanical Museum Leaflets, Harvard University 24(9): 249-274. Garay and Taylor noted that this species is closely related to O. decaryana, but O. angustifolia can be distinguished by its petiolate leaves and a labellum with different proportions.

Genoplesium pedersonii, commonly known as Pederson's midge orchid, is a small terrestrial orchid endemic to the Blackdown Tableland in Queensland. It has a single thin leaf fused to the flowering stem and up to thirty small, greenish red to reddish, self-pollinating flowers with a dark purplish red labellum.

The sepals, petals and labellum all have tiny hairs on their edges. The dorsal sepal is about long and wide with a pointed tip. The lateral sepals are about long, wide and spread widely apart from each other. The petals are about long, wide with a sharply pointed tip.

Genoplesium sigmoideum, commonly known as the Dave's Creek midge orchid, is a small terrestrial orchid endemic to a small area in the Lamington National Park in Queensland. It has a single thin leaf fused to the flowering stem and up to twenty dark red flowers with a hairy labellum.

Genoplesium sagittiferum, commonly known as the horned midge orchid and as Corunastylis sagittifera in Australia, is a small terrestrial orchid endemic to New South Wales. It has a single thin leaf fused to the flowering stem and up to ten small, yellowish-green flowers with a hairy reddish labellum.

Caladenia atradenia was first formally described by David Jones, Brian Molloy and Mark Clements and the description was published in The Orchadian. The specific epithet (atradenia) is from the Latin word ater meaning "black" and the ancient Greek word aden meaning "gland" referring to the blackish labellum calli.

The edge of the labellum is serrated and there are two rows of white-tipped calli along its centre. Flowering occurs from August to early October, however the flowers are often open for only one or two days and sometimes self-pollinate and do not open at all.

The galea is translucent green with dark green stripes. The lateral sepals turn downwards and are long, wide and joined for more than half their length. The labellum is long, about wide and pale green with a blackish stripe along its mid-line. Flowering occurs from July to September.

Flowering stems one to three large, white and pink flowers. The upper petals are white, up to in length and across. The pouch-shaped labellum is rose-pink to magenta in length. Despite producing a large amount of seeds per seed pod, it reproduces largely by vegetative reproduction.

Genoplesium validum, commonly known as the Blackdown midge orchid, is a small terrestrial orchid endemic to the Blackdown Tableland National Park in Queensland. It has a single thin leaf fused to the flowering stem and up to thirty five greenish-brown flowers with reddish stripes and a hairy labellum.

Chiloglottis chlorantha, commonly known as the Wollongong bird orchid, is a species of orchid endemic to a small part of New South Wales. It has two broad leaves and a single green to yellowish green flower with about twelve reddish, yellowish or bright green glands on the labellum callus.

The base of the labellum is marked with narrow white lines. The single functional stamen has a white anther, about 6 mm long, with approximately 3 mm long spurs formed from the connective tissue between the two capsules of the anther. The ovary is about 1.2 cm long.

The dorsal sepal is a tapering egg shape, about long and wide. The lateral sepals are lance-shaped, curved, about long, wide and fused at their bases. The petals are long, wide and curve forwards. The labellum is variably coloured, about long, wide and sharply upwards near its middle.

The dorsal sepal is erect, long and wide. The lateral sepals are long, wide, spread widely and downturned with drooping ends. The petals are long, wide and arranged like the lateral sepals. The labellum is long, wide and white to cream-coloured, often with a dark red tip.

The lateral lobes are also toothed near the mid-lobe. There are four rows of foot-shaped calli which are reddish and about at the back of the labellum, decreasing in size towards the front. The column is long and has reddish markings. Flowering occurs from August to October.

The dorsal sepal is long, wide and curved forwards. The lateral sepals are long, wide and turn downwards. The petals are long, about wide and arranged like the lateral sepals. The labellum is long, wide and mostly dark red with its sides turned up and the tip curled under.

Habenaria halata, commonly known as the sweet rein orchid, is a species of orchid that is endemic to northern parts of the Northern Territory. It has two or three leaves at its base and up to eighteen small white, sweet-smelling flowers with a labellum shaped like a trident.