Pterostylis allantoidea

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.

Shy greenhood
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Cranichideae
Genus: Pterostylis
Species:
P. allantoidea
Binomial name
Pterostylis allantoidea
Synonyms[2]

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]

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References
  1. "Pterostylis allantoidea". APNI. Retrieved 10 June 2017.
  2. "Pterostylis allantoidea". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  3. 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.
  4. 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.
  5. Hoffman, Noel; Brown, Andrew (2011). Orchids of South-West Australia (3rd ed.). Gooseberry Hill: Noel Hoffman. p. 403. ISBN 9780646562322.
  6. Rogers, Richard Sanders (1940). "Contributions to the Orchidology of Australia". Proceedings of the Royal Society of South Australia. 64: 139. Retrieved 10 June 2017.
  7. "Pterostylis allantoidea Lindl". FloraBase. Western Australian Government Department of Parks and Wildlife.
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