| 词条 | Pterostylis platypetala |
| 释义 |
| name = Broad-petalled snail orchid | image = | image_caption = | genus = Pterostylis | species = platypetala | authority = D.L.Jones & C.J.French[1] | synonyms_ref = | synonyms = }} Pterostylis platypetala, commonly known as the broad-petalled snail orchid, is a species of orchid endemic to the south-west of Western Australia. It has a rosette of leaves and when flowering, a single green and white flower with relatively wide petals. In ideal conditions it can form colonies of hundreds of plants and often grows under melaleucas on the edge of winter-wet areas. DescriptionPterostylis platypetala is a terrestrial, perennial, deciduous, herb with an underground tuber. It has a leaf rosette {{convert|14-25|mm|in|sigfig=1|abbr=on}} in diameter. Flowering plants have a single green and white flower {{convert|15-25|mm|in|sigfig=1|abbr=on}} long and {{convert|8-10|mm|in|sigfig=1|abbr=on}} wide on a flowering stem {{convert|50-120|mm|in|sigfig=1|abbr=on}} high. There are three or four stem leaves {{convert|5-15|mm|in|sigfig=1|abbr=on}} long and {{convert|3-8|mm|in|sigfig=1|abbr=on}} wide with their bases wrapped around the flowering stem. The dorsal sepal and petals are fused, forming a hood or "galea" over the column and the dorsal sepal tapers to a point. The petals are wider than those of similar greenhoods and extend beyond the end of the dorsal sepal. The lateral sepals are held closely against the galea, {{convert|12-20|mm|in|sigfig=1|abbr=on}} long and have thickened, club-like tips. The labellum is small and not visible from outside the flower. Flowering occurs from May to July.[1][2]Taxonomy and naming=Pterostylis platypetala was first formally described in 2015 by David Jones and Christopher French from a specimen collected in the Wandoo National Park and the description was published in Australian Orchid Review.[3] The specific epithet (platypetala) is derived from the Ancient Greek words πλατύς (platús) meaning “flat”[4]{{rp|167}} and petalon meaning "petal",[4]{{rp|466}} referring to the broad edges of the petals.[3]Distribution and habitatThe broad-petalled snail orchid grows in salmon gum and wandoo woodland and under melaleucas on the edge of winter-wet areas. It occurs between Kalbarri and Brookton.[1][2][5] ConservationPterostylis platypetala is listed as "not threatened" by the Government of Western Australia Department of Parks and Wildlife.[5]References1. ^1 {{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=354}} {{Taxonbar|from=Q29674319}}2. ^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=410|edition=3rd}} 3. ^1 2 {{cite web|title=Pterostylis platypetala|url=https://id.biodiversity.org.au/instance/apni/4083521|publisher=APNI|accessdate=5 July 2017}} 4. ^1 {{cite book|last1=Brown|first1=Roland Wilbur|title=The Composition of Scientific Words|date=1956|publisher=Smithsonian Institution Press|location=Washington, D.C.}} 5. ^1 {{FloraBase|name=Pterostylis platypetala|id = 45343}} 4 : Pterostylis|Endemic orchids of Australia|Orchids of Western Australia|Plants described in 2015 |
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