| 词条 | Diuris luteola |
| 释义 |
| name = Northern doubletail | image = | image caption = | status_system = | status = | regnum = Plantae | unranked_divisio = Angiosperms | unranked_classis = Monocots | ordo = Asparagales | familia = Orchidaceae | subfamilia = Orchidoideae | tribus = Diurideae | subtribus = Diuridinae | genus = Diuris | species = D. luteola | binomial = Diuris luteola | binomial_authority = D.L.Jones & B.Gray[1] | synonyms = }} Diuris luteola, commonly called the northern doubletail,[2] is a species of orchid which is endemic to Queensland. It has a single linear leaf at its base and up to six pale yellow flowers with a few brown markings. It grows in shallow, stony soil on tablelands in eastern parts of the state. DescriptionDiuris luteola is a tuberous, perennial herb with a single linear leaf {{convert|200-350|mm|in|sigfig=1|abbr=on}} long, {{convert|3-4|mm|in|sigfig=1|abbr=on}} wide with a purplish base. Up to six pale yellow flowers with a few brown markings, about {{convert|25|mm|in|sigfig=1|abbr=on}} wide are borne on a flowering stem {{convert|120-450|mm|in|sigfig=1|abbr=on}} tall. The dorsal sepal projects forward and is egg-shaped, {{convert|7-10|mm|in|sigfig=1|abbr=on}} long and {{convert|5-8|mm|in|sigfig=1|abbr=on}} wide. The lateral sepals are linear to lance-shaped with the narrower end towards the base, green with brown blotches, {{convert|12-20|mm|in|sigfig=1|abbr=on}} long, about {{convert|2|mm|in|sigfig=1|abbr=on}} wide, turned downwards and crossed over each other. The petals are more or less erect, spread apart from each other with an elliptic to egg-shaped blade with the narrower end towards the base. They are {{convert|6-10|mm|in|sigfig=1|abbr=on}} long and {{convert|4.5-8.5|mm|in|sigfig=1|abbr=on}} wide on a dark reddish brown stalk {{convert|3-5|mm|in|sigfig=2|abbr=on}} long. The labellum is {{convert|6-9|mm|in|sigfig=1|abbr=on}} long, usually projects forwards and has three lobes. The centre lobe is linear to egg-shaped, {{convert|4-7|mm|in|sigfig=1|abbr=on}} wide with a few pale brown markings. The side lobes are linear to oblong, erect, about {{convert|3|mm|in|sigfig=1|abbr=on}} long and {{convert|1-1.5|mm|in|sigfig=1|abbr=on}} wide. There are two parallel ridge-like calli about {{convert|5|mm|in|sigfig=2|abbr=on}} long near the base of the mid-line of the base of the labellum. Flowering occurs from July to September.[2][3]Taxonomy and namingDiuris luteola was first formally described in 1991 by David Jones and Bruce Gray from a specimen collected on the Atherton Tableland near Herberton and the description was published in Australian Orchid Research.[4] The specific epithet (luteola) is a Latin word meaning "yellowish",[5] referring to the colour of the flowers of this species.[3]Distribution and habitatThe northern doubletail grows in shallow soil in grassy forest from Mount Windsor adjacent to the Daintree National Park to the Blackdown Tableland.[2][3] References1. ^{{WCSP | 63417 | Diuris luteola}} 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|pages =129–130}} 3. ^1 2 {{cite journal|last1=Jones|first1=David L.|title=New taxa of Australian Orchidaceae|journal=Australian Orchid Research|date=1991|volume=2|pages=57–58}} 4. ^{{cite web|title=Duiris luteola|url= https://id.biodiversity.org.au/instance/apni/551653|publisher=APNI|accessdate=26 March 2018}} 5. ^{{cite book|last1=Brown|first1=Roland Wilbur|title=The Composition of Scientific Words|date=1956|publisher=Smithsonian Institution Press|location=Washington, D.C.|page = 500}} External links
4 : Diuris|Endemic orchids of Australia|Orchids of Queensland|Plants described in 1991 |
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