| 词条 | Caleana triens |
| 释义 |
| name = Broad-billed duck orchid | image = Paracaleana triens (8694947771).jpg | image_caption = Caleana triens in Wandoo National Park | status_system = | status = | regnum = Plantae | unranked_divisio = Angiosperms | unranked_classis = Monocots | ordo = Asparagales | familia = Orchidaceae | subfamilia = Orchidoideae | genus = Caleana | species = C. triens | binomial = Caleana triens | binomial_authority = (Hopper & A.P.Br.) M.A.Clem.[1] | synonyms_ref = [1] | synonyms =
}} Caleana triens, commonly known as broad-billed duck orchid[3] is a species of orchid endemic to the south-west of Western Australia. It has a single smooth leaf and is distinguished by its flattened labellum with calli only near its tip and by its relatively early flowering period. DescriptionCaleana triens has a single smooth, dull green or dull red leaf, {{convert|15-30|mm|in|sigfig=1|abbr=on}} long and {{convert|6-11|mm|in|sigfig=1|abbr=on}} wide. Usually only one greenish yellow and red flower, {{convert|20-25|mm|in|sigfig=1|abbr=on}} long and {{convert|12-15|mm|in|sigfig=1|abbr=on}} wide is borne on a thin, wiry stalk {{convert|60-140|mm|in|sigfig=1|abbr=on}} high. The dorsal sepal, lateral sepals and petals are narrow and hang downwards with the dorsal sepal pressed against the column which has broad wings, forming a bucket-like shape. The labellum is flattened and only about one-third of the outer part of the labellum is covered with glossy black glands or calli. Flowering occurs in September and October.[2][3]Taxonomy and namingThe broad-billed duck orchid was first formally described in 2006 by Stephen Hopper and Andrew Brown who gave it the name Paracaleana triens. The type specimen was collected near York and description was published in Australian Systematic Botany.[4] In 2014, based on molecular studies, Joseph Miller and Mark Clements transferred all the species previously in Paracaleana to Caleana, so that the present species became Caleana triens.[5][6] The specific epithet (triens) is a Latin word meaning "third",[7] referring to there being calli only one-third of the outer part of the labellum.[3] Distribution and habitatCaleana triens grows in forest, woodland or shrubland in sandy soil between York and Esperance in the Avon Wheatbelt, Jarrah Forest and Mallee biogeographic regions.[2][3][8]ConservationCaleana triens (as Paracaleana triens) is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.[8]References1. ^{{WCSP | 489634 | Caleana triens}} {{Taxonbar|from1=Q42705435}}2. ^1 2 {{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=250|edition=3rd}} 3. ^1 2 {{cite book|last1=Brown|first1=Andrew|last2=Dundas|first2=Pat|last3=Dixon|first3=Kingsley|last4=Hopper|first4=Stephen|title=Orchids of Western Australia|date=2008|publisher=University of Western Australia Press|location=Crawley, Western Australia|isbn=9780980296457|page=305}} 4. ^{{cite web|title=Paracaleana triens|url=https://id.biodiversity.org.au/instance/apni/608589|publisher=APNI|accessdate=14 April 2018}} 5. ^1 {{cite web|title=Caleana triens|url=https://id.biodiversity.org.au/instance/apni/3697171|publisher=APNI|accessdate=14 April 2018}} 6. ^{{cite journal|last1=Miller|first1=Joseph T.|last2=Clements|first2=Mark A.|title=Molecular phylogenetic analyses of Drakaeinae: Diurideae (Orchidaceae) based on DNA sequences of the internal transcribed spacer region|journal=Australian Systematic Botany|date=2014|volume=27|issue=1|pages=3–22|doi=10.1071/SB13036|url=http://www.publish.csiro.au/SB/fulltext/SB13036|accessdate=14 April 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 = 798}} 8. ^1 {{FloraBase|name=Paracaleana triens|id=15423}} 5 : Caleana|Orchids of Western Australia|Endemic orchids of Australia|Plants described in 2006|Endemic flora of Western Australia |
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