| 词条 | Prasophyllum macrostachyum |
| 释义 |
| name = Laughing leek orchid | image = | image_caption = | taxon = Prasophyllum macrostachyum | authority= Lindl. | display_parents = 3 | synonyms_ref= [1] | synonyms=Prasophyllum macrostachyum R.Br. }} Prasophyllum macrostachyum, commonly known as the laughing leek orchid, is a species of orchid endemic to the south-west of Western Australia. It has a single smooth, tube-shaped leaf and up to thirty yellowish-green and purple flowers. It is one of the few Western Australian leek orchids which is not stimulated by summer fires and also has an unusually long flowering period. DescriptionPrasophyllum macrostachyum is a terrestrial, perennial, deciduous, herb with an underground tuber and a single tube-shaped leaf which is {{convert|120-200|mm|in|sigfig=1|abbr=on}} long and about {{convert|2|mm|in|sigfig=1|abbr=on}} in diameter near its reddish base. Between five and thirty flowers are widely spaced along a flowering stem which is up to {{convert|180|mm|in|sigfig=1|abbr=on}} long reaching to a height of {{convert|100-300|mm|in|sigfig=1|abbr=on}}. The flowers are green and purplish-red, about {{convert|8|mm|in|sigfig=1|abbr=on}} long and {{convert|6|mm|in|sigfig=1|abbr=on}} wide. As with others in the genus, the flowers are inverted so that the labellum is above the column rather than below it. The ovary is an oval shape, about {{convert|15|mm|in|sigfig=1|abbr=on}} long at maturity. The dorsal sepal is egg-shaped, {{convert|3-4|mm|in|sigfig=1|abbr=on}} long and green with red edges. The lateral sepals are egg-shaped to lance-shaped {{convert|3-4|mm|in|sigfig=1|abbr=on}} long and joined for about two-thirds of their length. The petals are only about {{convert|2|mm|in|sigfig=1|abbr=on}} long, more or less triangular and have purplish edges. The labellum is purplish, egg-shaped to lance-shaped, {{convert|3-4|mm|in|sigfig=1|abbr=on}} long and turns sharply upwards near its middle. Flowering occurs from September to January.[1][2][3]Taxonomy and namingPrasophyllum macrostachyum was first formally described in 1810 by Robert Brown and the description was published in Prodromus Florae Novae Hollandiae et Insulae Van Diemen.[4][5] The specific epithet (macrostachyum) is derived from the Ancient Greek words makros meaning "long"[6]{{rp|461}} and stachys meaning "an ear of grain" or "a spike",[6]{{rp|746}} referring to the long flowering stem.[3]Distribution and habitatThe laughing leek orchid grows with shrubs and sedges in areas that are wet in winter and occurs between Dongara and Cape Le Grand National Park.[3][2][7] ConservationThis orchid is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.[7] References1. ^{{cite journal|last1=Bates|first1=Robert J.|title=Prasophyllum calcicola, P. macrostachyum and P. ringens (Orchidaceae:Three similar species from Western and southern Australia|journal=Journal of the Adelaide Botanic Gardens|date=1989|volume=11|issue=2|pages=185–187|url=https://data.environment.sa.gov.au/Content/Publications/JABG11P179_Bates.pdf|accessdate=25 November 2017}} 2. ^1 {{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=356|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=325}} 4. ^1 {{cite web|title=Prasophyllum macrostachyum|url= https://id.biodiversity.org.au/instance/apni/534695|publisher=APNI|accessdate=25 November 2017}} 5. ^{{cite book|last1=Brown|first1=Robert|title=Prodromus florae Novae Hollandiae et insulae Van-Diemen, exhibens characteres plantarum quas annis 1802-1805|date=1810|location=London|page=318|url=https://www.biodiversitylibrary.org/item/21871#page/186/mode/1up|accessdate=25 November 2017}} 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. ^1 {{FloraBase|name=Prasophyllum macrostachyum|id=1677}} External links
4 : Prasophyllum|Endemic flora of Western Australia|Endemic orchids of Australia|Plants described in 1810 |
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