Pterostylis leptochila

Ravensthorpe rufous greenhood
Pterostylis leptochila growing south of Ravensthorpe
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Cranichideae
Genus: Pterostylis
Species:
P. leptochila
Binomial name
Pterostylis leptochila
Synonyms[2]

Oligochaetochilus leptochilus (M.A.Clem. & D.L.Jones) Szlach.

Pterostylis leptochila, commonly known as the Ravensthorpe rufous greenhood[3] or narrow-lipped rustyhood[4] is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. Both flowering and non-flowering plants have a relatively large rosette of leaves. Flowering plants also have up to five large translucent white flowers with olive green and brown lines and markings and a narrow, insect-like labellum.

leaf rosette
labellum detail

Description

Pterostylis leptochila is a terrestrial, perennial, deciduous, herb with an underground tuber and a rosette of between six and ten leaves. The leaves are 18–35 mm (0.7–1 in) long and 7–12 mm (0.3–0.5 in) wide. Flowering plants have a rosette at the base of the flowering stem but the leaves are usually withered by flowering time. Up to five or more translucent white, olive green and brown flowers, 23–27 mm (0.9–1 in) long and 7–8 mm (0.28–0.31 in) wide are borne on a flowering spike 150–250 mm (6–10 in) tall. The dorsal sepal and petals form a hood or "galea" over the column with the dorsal sepal having a narrow tip 5–7 mm (0.2–0.3 in) long. The lateral sepals turn downwards, slightly wider than the galea and suddenly taper to narrow tips 10–15 mm (0.4–0.6 in) long which turn forward and spread apart from each other. The labellum is fleshy, greenish-brown and insect-like, 5–6 mm (0.20–0.24 in) long, about 2 mm (0.08 in) wide and covered with short hairs. Flowering occurs from September to November.[3][4][5]

Taxonomy and naming

Pterostylis leptochila was first formally described in 1989 by Mark Clements and David Jones from a specimen collected near Ravensthorpe and the description was published in Australian Orchid Research.[1] The specific epithet (leptochila) is derived from the Ancient Greek words leptos meaning "fine" or "small"[6]: 488  and cheilos meaning "lip" or "rim"[6]: 486  referring to the narrow labellum of this orchid.[3]

Distribution and habitat

The Ravensthorpe rufous greenhood grows in rocky soil in woodland and shrubland between Jerramungup and Ravensthorpe in the Esperance Plains and Mallee biogeographic regions.[3][4][5][7]

Conservation

Pterostylis leptochila is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.[7]

References

  1. ^ a b "Pterostylis leptochila". APNI. Retrieved 1 July 2017.
  2. ^ "Pterostylis leptochila". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  3. ^ a b c d Brown, Andrew; Dundas, Pat; Dixon, Kingsley; Hopper, Stephen (2008). Orchids of Western Australia. Crawley, Western Australia: University of Western Australia Press. p. 373. ISBN 9780980296457.
  4. ^ a b c Jones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. p. 330. ISBN 978-1877069123.
  5. ^ a b Hoffman, Noel; Brown, Andrew (2011). Orchids of South-West Australia (3rd ed.). Gooseberry Hill: Noel Hoffman. p. 441. ISBN 9780646562322.
  6. ^ a b Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press.
  7. ^ a b "Pterostylis leptochila". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.

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