Pterostylis allantoidea
Shy greenhood | |
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Scientific classification ![]() | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Monocots |
Order: | Asparagales |
Family: | Orchidaceae |
Subfamily: | Orchidoideae |
Tribe: | Cranichideae |
Genus: | Pterostylis |
Species: | P. allantoidea
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Binomial name | |
Pterostylis allantoidea R.S.Rogers[1]
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Synonyms[2] | |
Pterostylis allantoidea, commonly known as the shy greenhood is a species of orchid which is endemic to the south-west of Western Australia. It has a large rosette of leaves at the base of a flowering spike and a single white flower with green or reddish-brown stripes.
Description[]
Pterostylis allantoidea, is a terrestrial, perennial, deciduous, herb with an underground tuber and which usually grows in colonies. It has a rosette of large, dark green leaves with wrinkled edges, each leaf 5–15 mm (0.2–0.6 in) long and 1–10 mm (0.04–0.4 in) wide. When flowering, there is usually only a single, white flower with green or reddish-brown stripes. The flowers lean forwards and are 12–15 mm (0.5–0.6 in) long, 6–8 mm (0.2–0.3 in) wide and borne on a flowering spike 80–100 mm (3–4 in) tall. The dorsal sepal and petals form a hood over the column. The dorsal sepal is longer than the petals and has a thread-like tip 6–8 mm (0.2–0.3 in) long. The lateral sepals are erect with thread-like tips 10–14 mm (0.4–0.6 in) long with a bulging sinus between them. The labellum is egg-shaped, 4–5 mm (0.16–0.20 in) long, about 1 mm (0.04 in) wide, thick, fleshy, dark brown and curved and protrudes above the sinus. Flowering occurs from August to September.[3][4][5]
Taxonomy and naming[]
Pterostylis allantoidea was first formally described in 1940 by Richard Sanders Rogers in Transactions of the Royal Society of South Australia.[1][6] The specific epithet (allantoidea) is from the Latin allantoideus, 'sausage-shaped', referring to the shape of the labellum.[4]
Distribution and habitat[]
The shy greenhood grows on and near granite outcrops under shrubs between Coolgardie, Ravensthorpe and Israelite Bay in the Coolgardie and Esperance Plains biogeographic regions of Western Australia.[4][5][7]
Conservation status[]
Pterostylis allantoidea is classified as "not threatened" by the Government of Western Australia Department of Parks and Wildlife.[7]
References[]
- ^ a b "Pterostylis allantoidea". APNI. Retrieved 10 June 2017.
- ^ "Pterostylis allantoidea". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
- ^ Jones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. p. 297. ISBN 978-1877069123.
- ^ a b c Brown, Andrew; Dixon, Kingsley; French, Christopher; Brockman, Garry (2013). Field guide to the orchids of Western Australia : the definitive guide to the native orchids of Western Australia. Simon Nevill Publications. p. 352. ISBN 9780980348149.
- ^ a b Hoffman, Noel; Brown, Andrew (2011). Orchids of South-West Australia (3rd ed.). Gooseberry Hill: Noel Hoffman. p. 403. ISBN 9780646562322.
- ^ Rogers, Richard Sanders (1940). "Contributions to the Orchidology of Australia". Proceedings of the Royal Society of South Australia. 64: 139. Retrieved 10 June 2017.
- ^ a b "Pterostylis allantoidea Lindl". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
- Pterostylis
- Endemic orchids of Australia
- Orchids of Western Australia
- Plants described in 1940
- Endemic flora of Western Australia