| 词条 | Pterostylis saxicola |
| 释义 |
| name = Sydney plains rustyhood | image = | image_caption = | status_system = EPBC | status = EN | genus = Pterostylis | species = saxicola | authority = D.L.Jones & M.A.Clem.[1] | synonyms_ref = [1] | synonyms = Oligochaetochilus saxicola (D.L.Jones & M.A.Clem.) D.L.Jones & M.A.Clem. }} Pterostylis saxicola, commonly known as the Sydney plains rustyhood,[3] or Sydney plains greenhood,[4] is a plant in the orchid family Orchidaceae and is endemic to New South Wales. It has a rosette of leaves at its base and up to ten reddish-brown flowers with translucent "windows", relatively wide lateral sepals with short-pointed tips and a dark brown, fleshy, insect-like labellum. DescriptionPterostylis saxicola, is a terrestrial, perennial, deciduous, herb with an underground tuber. It has a rosette of between five and eight egg-shaped leaves {{convert|15-45|mm|in|sigfig=1|abbr=on}} long and {{convert|5-15|mm|in|sigfig=1|abbr=on}} wide. Flowering plants have a rosette at the base of the flowering spike but the leaves are usually withered by flowering time. Up to ten reddish-brown flowers with translucent panels and {{convert|30-35|mm|in|sigfig=2|abbr=on}} long, {{convert|9-11|mm|in|sigfig=2|abbr=on}} wide are borne on a flowering spike {{convert|150-350|mm|in|sigfig=1|abbr=on}} tall. The flowers lean forward and there are two to four stem leaves with their bases wrapped around the flowering spike. The dorsal sepal and petals form a hood or "galea" over the column with the dorsal sepal having a narrow tip {{convert|2-3|mm|in|sigfig=1|abbr=on}} long. The lateral sepals turn downwards, are wider than the galea and taper to narrow tips {{convert|4-5|mm|in|sigfig=2|abbr=on}} long and about {{convert|10|mm|in|sigfig=1|abbr=on}} apart. The labellum is fleshy, dark brown and insect-like, {{convert|4-6|mm|in|sigfig=2|abbr=on}} long, about {{convert|3|mm|in|sigfig=1|abbr=on}} wide with a shallow channel along its mid-line. The "head" end is thick and has a few short hairs and the "body" has three to five longer hairs on each side. Flowering occurs from August to November.[2][3][4][5]Taxonomy and namingPterostylis saxicola was first formally described in 1997 by David Jones and Mark Clements and the description was published in The Orchadian.[6] The specific epithet (saxicola) is derived from the Latin word saxum meaning "rock"[7]{{rp|757}} and the suffix -cola meaning "dweller in".[7]{{rp|48}} Distribution and habitatThe Sydney plains rustyhood grows in small, shallow soil pockets in flat areas on top of sandstone rock shelves or on mossy rocks in gullies. it is only known from five locations in the Sydney regions between Picnic Point and Picton.[2][4][8] ConservationPterostylis saxicola is listed as "endangered" under the Australian Government Environment Protection and Biodiversity Conservation Act 1999. The main threats to the species are habitat loss and degradation from development, unrestricted access and grazing, weed invasion and inappropriate fire regimes.[5]References1. ^{{WCSP | 170650 | Pterostylis saxicola }} {{Taxonbar|from=Q15492864}}2. ^1 2 {{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|pages =324–325}} 3. ^1 {{cite web|title=Pterostylis saxicola (an orchid) - endangered species listing|url=http://www.environment.nsw.gov.au/determinations/PterostylisSaxicolaEndSpListing.htm|publisher=Government of New South Wales Office of Environment and Heriatage|accessdate=16 July 2017}} 4. ^1 {{cite web|last1=Jones|first1=David L.|title=Pterostylis saxicola|url=http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Pterostylis~saxicola|publisher=Royal Botanic Garden Sydney: plantnet|accessdate=16 July 2017}} 5. ^1 {{cite web|title=Approved Conservation Advice for Pterostylis saxicola (Sydney Plains Greenhood)|url=http://www.environment.gov.au/biodiversity/threatened/species/pubs/64537-conservation-advice.pdf|publisher=Australian Government Department of the Environment|accessdate=16 July 2017}} 6. ^1 {{cite web|title=Pterostylis saxicola|url=https://id.biodiversity.org.au/instance/apni/557077|publisher=APNI|accessdate=16 July 2017}} 7. ^1 {{cite book|last1=Brown|first1=Roland Wilbur|title=The Composition of Scientific Words|date=1956|publisher=Smithsonian Institution Press|location=Washington, D.C.}} 8. ^{{cite web|title=Approved Conservation Advice for Pterostylis saxicola (Sydney Plains Greenhood)|url=http://www.environment.gov.au/biodiversity/threatened/species/pubs/64537-conservation-advice.pdf|publisher=Australian Government Department of the Environment|accessdate=16 July 2017}} 4 : Pterostylis|Endemic orchids of Australia|Orchids of New South Wales|Plants described in 1997 |
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