| 词条 | Thelymitra circumsepta |
| 释义 |
| name = Naked sun orchid | image = Thelymitra circumsepta.jpg | image_caption = Thelymitra circumsepta near Durdidwarrah | regnum = Plantae | unranked_divisio = Angiosperms | unranked_classis = Monocots | ordo = Asparagales | familia = Orchidaceae | subfamilia = Orchidoideae | tribus = Diurideae | subtribus = Thelymitrinae | genus = Thelymitra | species = T. circumsepta | binomial = Thelymitra circumsepta | binomial_authority = Fitzg.[1] | synonyms_ref =[1] | synonyms = * Thelymitra retecta (Rupp) }} Thelymitra circumsepta, commonly called the naked sun orchid,[3] is a species of orchid that is endemic to south-eastern Australia. It has a single leathery, dark green leaf and up to twenty blue to purplish or pink flowers with fringed lobes and yellowish hair tufts on top of the column. DescriptionThelymitra circumsepta is a tuberous, perennial herb with a single leathery, channelled, dark green, linear to lance-shaped leaf {{convert|150-300|mm|in|sigfig=1|abbr=on}} long and {{convert|15-25|mm|in|sigfig=1|abbr=on}} wide with a purplish base. Up to twenty blue to purplish or pink flowers {{convert|20-30|mm|in|sigfig=1|abbr=on}} wide are arranged on a flowering stem {{convert|150-700|mm|in|sigfig=1|abbr=on}} tall. The sepals and petals are {{convert|9-15|mm|in|sigfig=1|abbr=on}} long and {{convert|5-6|mm|in|sigfig=2|abbr=on}} wide. The column is pale blue or greenish, {{convert|3-5|mm|in|sigfig=1|abbr=on}} long and about {{convert|2|mm|in|sigfig=1|abbr=on}} wide. The lobe on the top of the anther is itself lobed with yellow fringed edges. The side lobes are finger-like with yellow, toothbrush-like tufts on their ends. The flowers are self-pollinated and only open on hot, humid days. Flowering occurs from December to February.[2][3][4]Taxonomy and namingThelymitra circumsepta was first formally described in 1878 by Robert Fitzgerald from a specimen he collected on Mount Tomah. The description was published in his book Australian Orchids.[5] The specific epithet (circumsepta) is derived from the Latin words circum meaning "around", "about" or "on all sides"[6]{{rp|102}} and septum meaning "inclosure", "barrier" or "partition".[6]{{rp|121}} Distribution and habitatThe naked sun orchid grows in swampy, high rainfall districts from near the coast to subalpine areas. It occurs on the coast and tablelands of New South Wales south from the New England Tableland, in south-eastern Victoria, the Mount Lofty Ranges of South Australia and in Tasmania.[2][3][4] Authorities in New Zealand regard a similar orchid occurring there and recorded by Hatch as T. formosa.[7] ConservationOnly between ten and twenty individuals of this species are known from South Australia and it is listed as "endangered" in that state. The main threats to the species there are competition with coral fern and altered water regimes.[8] References1. ^1 {{WCSP | 203727 | Thelymitra circumsepta }} 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 =246}} 3. ^1 {{cite web|last1=Jeanes|first1=Jeff|title=Thelymitra circumsepta|url=https://vicflora.rbg.vic.gov.au/flora/taxon/7c527451-df1e-4a70-a1b1-ea19ab5f4d11|publisher=Royal Botanic Gardens Victoria|accessdate=30 May 2018}} 4. ^1 {{cite web|last1=Bernhardt|first1=Peter|title=Thelymitra circumsepta|url=http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Thelymitra~circumsepta|publisher=Royal Botanic Garden Sydney|accessdate=30 May 2018}} 5. ^{{cite web|title=Thelymitra circumsepta|url= https://id.biodiversity.org.au/instance/apni/521984|publisher=APNI|accessdate=30 May 2018}} 6. ^1 {{cite book|last1=Brown|first1=Roland Wilbur|title=The Composition of Scientific Words|date=1956|publisher=Smithsonian Institution Press|location=Washington, D.C.}} 7. ^{{cite web|title=New Zealand Native Orchids - species list|url=http://www.nativeorchids.co.nz/Checklist.htm|publisher=New Zealand Native Orchid Group|accessdate=30 May 2018}} 8. ^{{cite web|title=Threatened species profile - Thelymitra circumsepta|url=https://www.naturalresources.sa.gov.au/files/sharedassets/public/plants_and_animals/threatened_plants/pa-fact-thelymitracircumsepta.pdf|publisher=Government of South Australia - Department for Environment and Heritage|accessdate=30 May 2018}} External links
7 : Thelymitra|Endemic orchids of Australia|Orchids of New South Wales|Orchids of Victoria (Australia)|Orchids of Tasmania|Orchids of South Australia|Plants described in 1878 |
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