Thrixspermum congestum
Thrixspermum congestum, commonly known as the cupped hairseed, is an epiphytic or lithophytic orchid that forms small clumps with many thin roots, up to fifteen leathery leaves and many star-shaped white or cream-coloured flowers. This orchid occurs from Papuasia to northern Australia.
Description
Thrixspermum congestum is an epiphytic or lithophytic herb that forms small clumps with many thin roots and flattened stems long. It has between six and fifteen crowded stiff, leathery leaves long and wide. The flowers are cream-coloured or white, long and wide arranged on a wiry flowering stem long. The sepals are long and wide, the petals a similar length but only about. The labellum is about long and wide with three lobes. The side lobes are hairy and erect, about long and wide, narrow, curved and pointed. The middle lobe is short, fleshy and hairy with a short, hairy spur. Flowering occurs sporadically and the flowers open from one to a few at a time.
Taxonomy and naming
The cupped hairseed was first formally described in 1895 by Frederick Bailey who gave it the name Cleisostoma congestum and published the description in Proceedings of the Royal Society of Queensland. In 1967, Alick Dockrill changed the name to Thrixspermum congestum. The specific epithet is a Latin word meaning "collected", "dense" or "thick".
Thrixspermum congestum grows on mangroves and rainforest trees in humid but airy situations. It occurs in New Guinea, the Solomon Islands, New Caledonia, Vanuatu and Australia. In Australia it is found on Melville Island and between the Iron Range and the Tully River in Queensland.