| 词条 | Pterostylis angusta |
| 释义 |
| name = Narrow shell orchid | image = | image_caption = | genus = Pterostylis | species = angusta | authority = A.S.George[1] | synonyms_ref = [1] | synonyms = Diplodium angustum (A.S.George) D.L.Jones & M.A.Clem. }} Pterostylis angusta, commonly known as the narrow shell orchid, is a species of orchid endemic to the south-west of Western Australia. As with similar greenhoods, the flowering plants differ from those which are not flowering. The non-flowering plants have a rosette of leaves flat on the ground but the flowering plants have a single flower with leaves on the flowering spike. In this species the flower is green, white and brown with an inflated base, a narrow hood and the longest labellum of any Western Australian Pterostylis species. DescriptionPterostylis angusta is a terrestrial, perennial, deciduous, herb with an underground tuber and when not flowering, a rosette of dark bluish-green leaves lying flat on the ground. Each leaf is {{convert|10-25|mm|in|sigfig=1|abbr=on}} long and {{convert|7-12|mm|in|sigfig=1|abbr=on}} wide. Flowering plants usually only have a single flower {{convert|12-15|mm|in|sigfig=1|abbr=on}} long and {{convert|7-8|mm|in|sigfig=1|abbr=on}} wide which leans slightly forwards on a flowering stem {{convert|80-200|mm|in|sigfig=1|abbr=on}} high with between three and seven stem leaves. The flowers are green and white, brownish near the tip. The dorsal sepal and petals are fused, forming a hood or "galea" over the column. The base of the galea is inflated and the top is narrow with a sharply-pointed end. The lateral sepals are held closely against the galea and have narrow tips {{convert|15-18|mm|in|sigfig=1|abbr=on}} long and a V-shaped sinus between their bases. The labellum is {{convert|13-15|mm|in|sigfig=1|abbr=on}} long, about {{convert|2|mm|in|sigfig=1|abbr=on}} wide and curved, and protrudes above the sinus. Flowering occurs from late May to July.[2][3][4]Taxonomy and namingPterostylis angusta was first formally described in 1971 by Alex George from a specimen collected near Mount Trio in the Stirling Range and the description was published in Nuytsia.[5] The specific epithet (angusta) is a Latin word meaning "narrow",[6] referring to the narrow galea.[3]Distribution and habitatThe narrow shell orchid grows in two disjunct areas in the Jarrah Forest biogeographic region, one between Brookton and the Stirling Range and the other between Australind and Capel. It mostly grows in woodland, often in sandy soil.[2][3][4][7] ConservationPterostylis angusta is listed as "not threatened" by the Government of Western Australia Department of Parks and Wildlife.[7]References1. ^{{WCSP | 170500 | Pterostylis angusta }} {{Taxonbar|from=Q15491172}}2. ^1 {{cite book|last1=Jones|first1=David L.|title=A complete guide to native orchids of Australia including the island territories|date=2006|publisher=New Holland|location=Frenchs Forest, N.S.W.|isbn=978-1877069123|page =294}} 3. ^1 2 {{cite book|last1=Brown|first1=Andrew|last2=Dixon|first2=Kingsley|last3=French|first3=Christopher|last4=Brockman|first4=Garry|title=Field guide to the orchids of Western Australia : the definitive guide to the native orchids of Western Australia|date=2013|publisher=Simon Nevill Publications|isbn=9780980348149|page=346}} 4. ^1 {{cite book|last1=Hoffman|first1=Noel|last2=Brown|first2=Andrew|title=Orchids of South-West Australia.|date=2011|publisher=Noel Hoffman|location=Gooseberry Hill|isbn=9780646562322|page=402|edition=3rd}} 5. ^1 {{cite web|title=Pterostylis angusta|url=https://id.biodiversity.org.au/instance/apni/486564|publisher=APNI|accessdate=14 June 2017}} 6. ^{{cite book|last1=Brown|first1=Roland Wilbur|title=The Composition of Scientific Words|date=1956|publisher=Smithsonian Institution Press|location=Washington, D.C.|page =90}} 7. ^1 {{FloraBase|name=Pterostylis angusta|id = 1685}} 4 : Pterostylis|Endemic orchids of Australia|Orchids of Western Australia|Plants described in 1971 |
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