Prasophyllum truncatum, commonly known as the truncate leek orchid, is a species of orchidendemic to Tasmania. It has a single tubular, dark green leaf and up to twenty whitish flowers with purplish and greenish-brown markings. It is a late-flowering leek orchid and its flowering is stimulated by earlier fire.
Prasophyllum truncatum is a terrestrial, perennial, deciduous, herb with an underground tuber and a single dark green, tube-shaped leaf which is 150–350 mm (6–10 in) long and 3–5 mm (0.12–0.20 in) wide near its red to purple base. Between ten and twenty whitish flowers with purplish and greenish-brown markings are loosely arranged along a flowering spike which is 70–110 mm (3–4 in) long, reaching to a height of 200–400 mm (8–20 in). The flowers are 7–9 mm (0.3–0.4 in) wide and as with other leek orchids, are inverted so that the labellum is above the column rather than below it. The dorsal sepal is lance-shaped to narrow egg-shaped, about 7–8.5 mm (0.28–0.33 in) long, about 4 mm (0.2 in) wide with five purplish striations. The lateral sepals are linear to lance-shaped, 7–8.5 mm (0.28–0.33 in) long, 1.5 mm (0.06 in) wide and free from each other. The petals are narrow linear, 7–8 mm (0.28–0.31 in) long, about 1 mm (0.04 in) wide and white with a purplish central line. The labellum is white, oblong to elliptic in shape, about 8 mm (0.3 in) long, about 4 mm (0.2 in) wide and turns sharply backwards on itself near its middle. The edges of the upturned part of the labellum have crinkled edges and there is a greenish-yellow, fleshy, raised callus in its centre extending just past the bend. Flowering occurs from November to March, more prolifically after fire.[2][3]
Taxonomy and namingedit
Prasophyllum truncatum was first formally described in 1840 by John Lindley from a specimen collected near Stanley and the description was published in The genera and species of Orchidaceous plants.[1][4] The specific epithet (truncatum) is a Latin word meaning "maimed" or "cut off".[5]
Distribution and habitatedit
The truncate leek orchid widely distributed but uncommon, growing with shrubs and herbs in woodland in both the north and south of Tasmania.[2][3]
Referencesedit
^ ab"Prasophyllum truncatum". APNI. Retrieved 1 January 2018.
^ abJones, David L. (1998). "Contributions to Tasmanian Orchidology". Australian Orchid Research. 3: 116–117.
^ abJones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. p. 202. ISBN1877069124.
^Lindley, John (1840). The genera and species of Orchidaceous plants. London: Ridgways. p. 513. Retrieved 1 January 2018.
^Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 708.
External linksedit
Media related to Prasophyllum truncatum at Wikimedia Commons
Data related to Prasophyllum truncatum at Wikispecies
January 01, 1970
prasophyllum, truncatum, commonly, known, truncate, leek, orchid, species, orchid, endemic, tasmania, single, tubular, dark, green, leaf, twenty, whitish, flowers, with, purplish, greenish, brown, markings, late, flowering, leek, orchid, flowering, stimulated,. Prasophyllum truncatum commonly known as the truncate leek orchid is a species of orchid endemic to Tasmania It has a single tubular dark green leaf and up to twenty whitish flowers with purplish and greenish brown markings It is a late flowering leek orchid and its flowering is stimulated by earlier fire Truncate leek orchid Illustration by Joseph Dalton Hooker Scientific classification Kingdom Plantae Clade Tracheophytes Clade Angiosperms Clade Monocots Order Asparagales Family Orchidaceae Subfamily Orchidoideae Tribe Diurideae Subtribe Prasophyllinae Genus Prasophyllum Species P truncatum Binomial name Prasophyllum truncatumLindl 1 Contents 1 Description 2 Taxonomy and naming 3 Distribution and habitat 4 References 5 External linksDescription editPrasophyllum truncatum is a terrestrial perennial deciduous herb with an underground tuber and a single dark green tube shaped leaf which is 150 350 mm 6 10 in long and 3 5 mm 0 12 0 20 in wide near its red to purple base Between ten and twenty whitish flowers with purplish and greenish brown markings are loosely arranged along a flowering spike which is 70 110 mm 3 4 in long reaching to a height of 200 400 mm 8 20 in The flowers are 7 9 mm 0 3 0 4 in wide and as with other leek orchids are inverted so that the labellum is above the column rather than below it The dorsal sepal is lance shaped to narrow egg shaped about 7 8 5 mm 0 28 0 33 in long about 4 mm 0 2 in wide with five purplish striations The lateral sepals are linear to lance shaped 7 8 5 mm 0 28 0 33 in long 1 5 mm 0 06 in wide and free from each other The petals are narrow linear 7 8 mm 0 28 0 31 in long about 1 mm 0 04 in wide and white with a purplish central line The labellum is white oblong to elliptic in shape about 8 mm 0 3 in long about 4 mm 0 2 in wide and turns sharply backwards on itself near its middle The edges of the upturned part of the labellum have crinkled edges and there is a greenish yellow fleshy raised callus in its centre extending just past the bend Flowering occurs from November to March more prolifically after fire 2 3 Taxonomy and naming editPrasophyllum truncatum was first formally described in 1840 by John Lindley from a specimen collected near Stanley and the description was published in The genera and species of Orchidaceous plants 1 4 The specific epithet truncatum is a Latin word meaning maimed or cut off 5 Distribution and habitat editThe truncate leek orchid widely distributed but uncommon growing with shrubs and herbs in woodland in both the north and south of Tasmania 2 3 References edit a b Prasophyllum truncatum APNI Retrieved 1 January 2018 a b Jones David L 1998 Contributions to Tasmanian Orchidology Australian Orchid Research 3 116 117 a b Jones David L 2006 A complete guide to native orchids of Australia including the island territories Frenchs Forest N S W New Holland p 202 ISBN 1877069124 Lindley John 1840 The genera and species of Orchidaceous plants London Ridgways p 513 Retrieved 1 January 2018 Brown Roland Wilbur 1956 The Composition of Scientific Words Washington D C Smithsonian Institution Press p 708 External links edit nbsp Media related to Prasophyllum truncatum at Wikimedia Commons nbsp Data related to Prasophyllum truncatum at Wikispecies Retrieved from https en wikipedia org w index php title Prasophyllum truncatum amp oldid 1020441534, wikipedia, wiki, book, books, library,
