Genoplesium despectans


Genoplesium despectans, commonly known as sharp midge orchid and known as Corunastylis despectans in Australia, is a small terrestrial orchid endemic to south-eastern Australia. It has a single thin leaf fused to the flowering stem and up to forty five small, dark purple or green and purple flowers.

Description

Genoplesium despectans is a terrestrial, perennial, deciduous, herb with an underground tuber and a single thin leaf long and fused to the flowering stem with the free part long. Up to forty five dark purple or green and purple flowers are crowded along a flowering stem tall. The flowers lean downwards and are about long and wide. The flowers are inverted so that the labellum is above the column rather than below it. The dorsal sepal is egg-shaped, about long and about wide. The lateral sepals are linear to lance-shaped, about long, wide and spread apart from each other. The petals are egg-shaped, about long and wide with a pointed tip. The labellum is lance-shaped, thick and fleshy, about long, wide and sharply pointed with fine teeth along its edges. 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.

Taxonomy and naming

Sharp midge orchid was first formally described in 1858 by Joseph Dalton Hooker who gave it the name Prasophyllum despectans and published the description in Flora Antarctica. In 1989, David Jones and Mark Clements changed the name to Genoplesium despectans and in 2002 changed the name again to Corunastylis despectans. The specific epithet is derived from a Latin word meaning "to look down upon".

Distribution and habitat

Genoplesium despectans grows in heath and heathy forest south from Wollongong in New South Wales and is common and widespread in Victoria. It also found in the south-east of South Australia and in Tasmania.