| 词条 | Diuris fragrantissima |
| 释义 |
| name = Fragrant doubletail | image = | image caption = | status_system = EPBC | status = EN | regnum = Plantae | unranked_divisio = Angiosperms | unranked_classis = Monocots | ordo = Asparagales | familia = Orchidaceae | subfamilia = Orchidoideae | tribus = Diurideae | subtribus = Diuridinae | genus = Diuris | species = D. fragrantissima | binomial = Diuris fragrantissima | binomial_authority = D.L.Jones & M.A.Clem.[1] | synonyms = }} Diuris fragrantissima, commonly called the fragrant doubletail[2] or Sunshine diuris,[3] is a species of orchid which is endemic to a small area to the west of Melbourne. It has two linear leaves at its base and up to twelve white flowers with mauve or pale purple markings with unusually long lateral sepals. Only about thirty plants survive in grassland near Sunshine. DescriptionDiuris fragrantissima is a tuberous, perennial herb with two linear leaves {{convert|100-180|mm|in|sigfig=1|abbr=on}} long, {{convert|5-10|mm|in|sigfig=1|abbr=on}} wide and folded lengthwise. Up to twelve white flowers with mauve or pale purple markings, {{convert|30-35|mm|in|sigfig=2|abbr=on}} wide are borne on a flowering stem {{convert|100-200|mm|in|sigfig=1|abbr=on}} tall. The dorsal sepal is erect, egg-shaped, {{convert|12-15|mm|in|sigfig=1|abbr=on}} long and {{convert|8-12|mm|in|sigfig=1|abbr=on}} wide. The lateral sepals are narrow lance-shaped, {{convert|50-85|mm|in|sigfig=1|abbr=on}} long, about {{convert|2|mm|in|sigfig=1|abbr=on}} wide, turned downwards at an angle and almost parallel to each other. The petals are erect or turned backwards with an elliptic or egg-shaped blade {{convert|9-12|mm|in|sigfig=1|abbr=on}} long and {{convert|6-8|mm|in|sigfig=1|abbr=on}} wide on a green stalk {{convert|5-8|mm|in|sigfig=1|abbr=on}} long. The labellum is {{convert|9-12|mm|in|sigfig=1|abbr=on}} long and has three lobes. The centre lobe is fan-shaped or heart-shaped, {{convert|8-10|mm|in|sigfig=1|abbr=on}} long, {{convert|7-10|mm|in|sigfig=1|abbr=on}} wide with a raised ridge along its midline and wrinkled edges. The side lobes are erect, irregularly shaped, {{convert|3.5-5|mm|in|sigfig=1|abbr=on}} long and about {{convert|2|mm|in|sigfig=1|abbr=on}} wide. There are two ridge-like calli {{convert|4-5|mm|in|sigfig=2|abbr=on}} long near the base of the mid-line of the base of the labellum. Flowering occurs in October and November.[2][3][4]Taxonomy and namingThe fragrant doubletail was first formally described in 1964 by Alick Dockrill from an unpublished description by Herman Rupp and given the name Diuris punctata var. albo-violacea. The description was published in The Victorian Naturalist.[5][6] In 1989 David Jones and Mark Clements changed the name to D. fragrantissima noting that it differs from D. punctata in "having a dwarf habit, the stiff, erect habit of the flowers that are white with purple markings, and its strong fragrance".[7][8] The specific epithet (fragrantissima) is the superlative form of the Latin word fragrans meaning "smelling agreeably".[9] Distribution and habitatAt the time of European settlement, D. fragrantissima was plentiful in the grasslands to the west of Melbourne, but as early as 1934, W.H. Nicholls noted that it had become scarse. The population continued to decline until only one plant survived in the wild in 1992. About thirty wild plants of Diuris fragrantissima survive in grassland near Sunshine and others have been introduced to a small reserve near Altona. The populations at both Sunshine and Altona are under great stress due to the encroachment of industrial and residential development. Ecological processes such as the loss of natural pollinators also threaten this species. About 200 individuals survive in cultivation, mostly at Melbourne Zoo and the Royal Botanic Gardens Victoria.[3] ConservationDiuris fragrantissima is classified as "endangered" under the Australian government Environment Protection and Biodiversity Conservation Act 1999 and the Victorian government Flora and Fauna Guarantee Act 1988. The main threats to the species are weed invasion, predation, especially by the introduced house mouse (Mus musculus), altered fire regimes and human interference.[3]References1. ^{{WCSP | 63405 | Diuris fragrantissima}} {{Taxonbar|from=Q10267389}}{{DEFAULTSORT:Diuris fragrantissima}}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=1877069124|page =132}} 3. ^1 2 3 {{cite web|last1=Murphy|first1=Anna H.|last2=Webster|first2=Alan|last3=Knight|first3=Colin|last4=Lester|first4=Karen|title=National recovery plan for the Sunshine diuris Diuris fragrantissima|url=http://www.environment.gov.au/system/files/resources/affef381-fa71-47f7-bf76-9099a047ea9c/files/diuris-fragrantissima.pdf|publisher=Australian Government Department of the Environment|accessdate=22 March 2018}} 4. ^{{cite web|last1=Jeanes|first1=Jeff|title=Diuris fragrantissima|url=https://vicflora.rbg.vic.gov.au/flora/taxon/f3b6144d-ddb9-48ed-b06d-d6c1bd4c5f48|publisher=Royal Botanic Gardens Victoria|accessdate=22 March 2018}} 5. ^{{cite web|title=Diuris punctata var. albo-violacea|url= https://id.biodiversity.org.au/instance/apni/520657|publisher=APNI|accessdate=22 March 2018}} 6. ^{{cite journal|last1=Dockrill|first1=Alick W.|title=The Eastern Australian Orchid, Diuris punctata|journal=The Victorian Naturalist|date=1964|volume=81|page=137|url=https://www.biodiversitylibrary.org/item/127188#page/130/mode/1up|accessdate=22 March 2018}} 7. ^{{cite web|title=Duiris fragrantissima|url= https://id.biodiversity.org.au/instance/apni/494351|publisher=APNI|accessdate=22 March 2018}} 8. ^{{cite journal|last1=Clements|first1=Mark A.|title=Catalogue of Australian Orchidaceae|journal=Australian Orchid Research|date=1989|volume=1|page=68}} 9. ^{{cite book|last1=Brown|first1=Roland Wilbur|title=The Composition of Scientific Words|date=1956|publisher=Smithsonian Institution Press|location=Washington, D.C.|page =352}} 4 : Diuris|Endemic orchids of Australia|Orchids of Victoria (Australia)|Plants described in 1991 |
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