Corybas diemenicus
Corybas diemenicus, commonly known as the stately helmet orchid or veined helmet orchid, is a species of terrestrial orchid endemic to south-eastern Australia. It has round or heart-shaped leaf and a reddish purple flower with a central white patch.
Description
Corybas diemenicus is a terrestrial, perennial, deciduous, herb with a single round or heart-shaped leaf long and wide. The leaf is green on the upper surface and silvery green on the lower side. There is usually only a single erect, dark reddish to purple flower with translucent areas, long and wide. The dorsal sepal is long and wide on a stalk about long and forms a hood over the labellum. The lateral sepals are about long, joined at their bases before tapering to a fine tip. The petals are wider than but shorter than the lateral sepals and joined to them. The labellum is long, wide and tube-shaped with a white centre and many short, broad teeth on the edges. Flowering occurs from June to December.
Taxonomy
The stately helmet orchid was first formally described in 1840 by John Lindley and given the name Corysanthes diemenica. The description was published in Lindley's book The Genera and Species of Orchidaceous Plants. In 1942 Herman Rupp and William Nicholls changed the name to Corybas diemenicus. The specific epithet is a Latin word meaning "belonging to, or from Tasmania".
Distribution and habitat
Corybas diemenicus is widespread and common, growing in moist forest and rainforest, sometimes in drier habitats. It occurs in New South Wales south from Barrington Tops National Park through the Australian Capital Territory to the south-east of Victoria and Tasmania.