| Rough greenhood | |
|---|---|
| |
| Pterostylis scabrida growing near the Rapid River in Tasmania | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Asparagales |
| Family: | Orchidaceae |
| Subfamily: | Orchidoideae |
| Tribe: | Cranichideae |
| Genus: | Pterostylis |
| Species: | P. scabrida
|
| Binomial name | |
| Pterostylis scabrida | |
Pterostylis scabrida, commonly known as the rough greenhood, is a species of orchid endemic to Tasmania. It has a rosette of leaves at the base of the plant and a single green and white flower on a rough stem. It is widespread and common in wet forests and is one of the few species of Pterostylis to grow in rainforest.
Description
Pterostylis scabrida is a terrestrial, perennial, deciduous, herb with an underground tuber and a rosette of dark green leaves loosely surrounding the base of the flowering stem. Each leaf is 30–60 mm long and 8–10 mm wide. A single green and white flower 20–25 mm long and 14–16 mm wide is borne on a rough flowering stem 80–250 mm high. The dorsal sepal and petals are fused, forming a hood or "galea" over the column. The dorsal sepal is the same length as the petals and curves forward with a pointed tip. There is a wide gap between the galea and the lateral sepals. The lateral sepals are erect and have thread-like tips 14–16 mm long and a slightly bulging, V-shaped notch sinus between them. The labellum is 12–15 mm long, about 3 mm wide, brown and curved and protrudes above the sinus. Flowering occurs from October to February.[2][3]
Taxonomy and naming
Pterostylis scabrida was first formally described in 1840 by John Lindley and the description was published in his book, The Genera and Species of Orchidaceous Plants.[1][4] The specific epithet (scabrida) is a Latin word meaning "rough" or "rugged".[5]
Distribution and habitat
The rough greenhood is widespread and common in wet forests, including rainforest, throughout Tasmania.[2][3][6]
References
- ^ a b "Pterostylis scabrida". APNI. Retrieved 27 May 2017.
- ^ a b Jones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. p. 306. ISBN 978-1877069123.
- ^ a b Jones, David L. (1998). "Contributions to the Orchidology of Tasmania". Australian Orchid Research. 3: 151–152.
- ^ Lindley, John (1840). The Genera and Species of Orchidaceous Plants. London: Ridgways. p. 389. Retrieved 4 December 2021.
- ^ Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 670.
- ^ D.L.Jones; T.Hopley; S.M.Duffy (2010). "Pterostylis". Australian Tropical Rainforest Orchids. Centre for Australian National Biodiversity Research (CANBR), Australian Government. Retrieved 31 May 2021.
This page was last edited on 4 December 2021, at 22:51