| 词条 | Diuris palustris |
| 释义 |
| name = Swamp doubletail | image = | image_caption = | regnum = Plantae | unranked_divisio = Angiosperms | unranked_classis = Monocots | ordo = Asparagales | familia = Orchidaceae | subfamilia = Orchidoideae | tribus = Diurideae | subtribus = Diuridinae | genus = Diuris | species = D. palustris | binomial = Diuris palustris | binomial_authority = Lindl.[1] }} Diuris palustris, commonly known as the swamp doubletail[2] or swamp diuris[3] is a species of orchid which is endemic to south-eastern Australia. It has a tuft of between eight and ten twisted leaves and up to four yellow flowers with brown spots and blotches marks and blotches. DescriptionDiuris palustris is a tuberous, perennial herb with a tuft of between eight and ten twisted, linear leaves {{convert|100-300|mm|in|sigfig=1|abbr=on}} long, {{convert|4-6|mm|in|sigfig=2|abbr=on}} wide and folded lengthwise. Up to four flowers {{convert|15-20|mm|in|sigfig=1|abbr=on}} wide are borne on a flowering stem {{convert|50-150|mm|in|sigfig=1|abbr=on}} tall. The flowers are yellow with dark brown spots and blotches. The dorsal sepal is erect, curved backwards near the tip, egg-shaped, {{convert|7-10|mm|in|sigfig=1|abbr=on}} long and {{convert|5-6|mm|in|sigfig=2|abbr=on}} wide. The lateral sepals are green, {{convert|12-15|mm|in|sigfig=1|abbr=on}} long, about {{convert|2|mm|in|sigfig=1|abbr=on}} wide, turned downwards and parallel to each other. The petals are erect to curved backwards, with an egg-shaped blade {{convert|4-6|mm|in|sigfig=2|abbr=on}} long and {{convert|3-4|mm|in|sigfig=1|abbr=on}} wide on a dark reddish brown stalk {{convert|3-4|mm|in|sigfig=1|abbr=on}} long. The labellum is {{convert|7-10|mm|in|sigfig=1|abbr=on}} long and has three lobes. The centre lobe is spatula-shaped, {{convert|3-4|mm|in|sigfig=1|abbr=on}} wide and the side lobes are erect, oval, {{convert|4-6|mm|in|sigfig=2|abbr=on}} long and {{convert|2-3|mm|in|sigfig=1|abbr=on}} wide with rounded teeth near the tip. There are two ridged calli {{convert|4-5|mm|in|sigfig=2|abbr=on}} long in the mid-line of the labellum. Flowering occurs from August to October.[2][3][4]Taxonomy and namingDiuris palustris was first formally described in 1840 by John Lindley and the description was published in his book, The Genera and Species of Orchidaceous Plants.[5][6] The specific epithet (palustris) is a Latin word meaning "marshy" or "boggy".[7]Distribution and habitatThe swamp doubletail is found in New South Wales, Victoria, Tasmania and South Australia where it is most common. It grows in moist or wet soil in forest, Callitris woodland and grassland.[2][3][4] ConservationDiuris palustris is classed as "vulnerable" under the Victorian Flora and Fauna Guarantee Act 1988 and as "endangered" under the Tasmanian Threatened Species Protection Act 1995.[3][8]References1. ^{{WCSP | 63431 | Diuris palustris}} {{Taxonbar|from=Q10267408}}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=1877069124|page =120}} 3. ^1 2 3 {{cite web|last1=Jeanes|first1=Jeff|title=Diuris palustris|url=https://vicflora.rbg.vic.gov.au/flora/taxon/ce8badcb-fed8-4b50-a26a-fde1a406cb2b|publisher=Royal Botanic Gardens Victoria|accessdate=28 March 2018}} 4. ^1 {{cite web|title=Diuris palustris|url=http://www.flora.sa.gov.au/cgi-bin/speciesfacts_display.cgi?form=speciesfacts&family=&genus=Diuris&species=palustris&iname=&submit=Display|publisher=State Herbarium of South Australia|accessdate=28 March 2018}} 5. ^{{cite web|title=Duiris palustris|url= https://id.biodiversity.org.au/instance/apni/520109|publisher=APNI|accessdate=28 March 2018}} 6. ^{{cite book|last1=Lindley|first1=John|title=The Genera and Species of Orchidaceous Plants|date=1840|publisher=Ridgways|location=London|page=507|url=https://www.biodiversitylibrary.org/item/9889#page/519/mode/1up|accessdate=28 March 2018}} 7. ^{{cite book|last1=Brown|first1=Roland Wilbur|title=The Composition of Scientific Words|date=1956|publisher=Smithsonian Institution Press|location=Washington, D.C.|page =514}} 8. ^{{cite web|title=Threatened species listing statement Swamp Diuris Diuris palustris|url=https://www.naturalvaluesatlas.tas.gov.au/downloadattachment?id=13884|publisher=Tasmanian Government Department of Primary Industries, Parks, Water and Environment|accessdate=28 March 2018}} 6 : Diuris|Orchids of South Australia|Orchids of Tasmania|Orchids of Victoria (Australia)|Endemic orchids of Australia|Plants described in 1840 |
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