Prasophyllum incompositum is a species of orchid endemic to Queensland. It has a single tubular, dark green leaf and up to thirty scented, greenish-brown and white flowers. It has only been recorded from the Carnarvon National Park.
Prasophyllum incompositum is a terrestrial, perennial, deciduous, herb with an underground tuber and a single tube-shaped, dark green leaf which is NaNsigfig=1NaNsigfig=1 long and NaNsigfig=1NaNsigfig=1 wide near its reddish base. Between five and thirty fragrant, greenish-brown and white flowers are untidily arranged along a flowering spike which is NaNsigfig=1NaNsigfig=1 long. The flowers are NaNsigfig=1NaNsigfig=1 wide and as with other leek orchids, are inverted so that the labellum is above the column rather than below it. The dorsal sepal is egg-shaped, NaNsigfig=1NaNsigfig=1 long, about NaNsigfig=1NaNsigfig=1 wide and the lateral sepals are linear to lance-shaped, NaNsigfig=1NaNsigfig=1 long, about 2sigfig=1NaNsigfig=1 wide and spread widely apart from each other. The petals are linear to lance-shaped, NaNsigfig=1NaNsigfig=1 long, about 2sigfig=1NaNsigfig=1 wide and white with a dark central stripe. The labellum is oblong to egg-shaped, NaNsigfig=2NaNsigfig=2 long, about 4sigfig=2NaNsigfig=2 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.[1]
Prasophyllum incompositum was first formally described in 1991 by David Jones from a specimen collected in the Carnarvon National Park and the description was published in Australian Orchid Research.[2] The specific epithet (incompositum) is a Latin word meaning "disarranged" or "confused",[3] referring to the disorganised appearance of the flowering stem.
This leek orchid grows in moist, grassy places in woodland and has only been recorded from the Carnarvon National Park.