Prasophyllum unicum is a species of terrestrial orchid that is endemic to New South Wales. It has a single leaf fused to the flowering stem and between two and fifteen flowers with a dark reddish labellum.
Prasophyllum unicum is a terrestrial, perennial, deciduous, herb with an underground tuber and a single leaf sheathing the flowering stem at the base. Between two and fifteen flowers are arranged on a flowering stem high. The flowers are inverted so that the labellum is above the column rather than below it. The dorsal sepal is about long and oblong, narrowing to a long, thread-like tip, and barely forming a hood over the column. The lateral sepals are lance-shaped, about long and swollen at the base. The petals are narrow, shorter than the dorsal sepal with a fine, thread-like tip. The labellum is spatula-shaped with a thread-like tip, and a two thick, parallel, dark reddish calli.[1]
Prasophyllum unicum was first formally described in 1942 by Herman Montague Rupp in The Victorian Naturalist from specimens collected in Normanhurst in the same year.[2] The name is accepted at Plants of the World Online but is considered a synonym of Corunastylis rufa at the Australian Plant Census.[3] The specific epithet (unica) means "unique", "because it stands alone among all forms hitherto described".
Prasophyllum unicum occurs in New South Wales.