Shy greenhood | |
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Scientific classification
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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 | |
Synonyms [1] | |
Pterostylis allantoidea, commonly known as shy greenhood, [2] 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.
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. [2] [3] [4]
Pterostylis allantoidea was first formally described in 1940 by Richard Sanders Rogers in Transactions of the Royal Society of South Australia. [5] [6] The specific epithet (allantoidea) is from the Latin allantoideus, 'sausage-shaped', referring to the shape of the labellum. [2]
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. [2] [4] [7]
Pterostylis allantoidea is classified as "not threatened" by the Government of Western Australia Department of Parks and Wildlife. [7]