| 词条 | Prasophyllum caudiculum |
| 释义 |
| name = Guyra leek orchid | status_system = | status = | image = Prasophyllum caudiculum flower.jpg | image_caption = Prasophyllum caudiculum growing near Guyra | taxon = Prasophyllum caudiculum | authority= D.L.Jones[1] | display_parents = 3 }} Prasophyllum caudiculum, commonly known as the Guyra leek orchid, is a species of orchid endemic to a small area of northern New South Wales. It has a single tubular, bright green leaf and up to thirty five greenish to reddish-brown flowers crowded along an erect flowering stem. It grows in grassy places near Guyra. DescriptionPrasophyllum caudiculum is a terrestrial, perennial, deciduous, herb with an underground tuber and a single tube-shaped, bright green leaf, {{convert|300-450|mm|in|sigfig=2|abbr=on}} long with a reddish-purple base. Between ten and thirty five flowers are crowded along the flowering spike. The flowers are greenish-brown to reddish-brown. As with others in the genus, the flowers are inverted so that the labellum is above the column rather than below it. The dorsal sepal is narrow egg-shaped to lance-shaped, {{convert|6-7|mm|in|sigfig=1|abbr=on}} long, about {{convert|3|mm|in|sigfig=1|abbr=on}} wide and curves downwards. The lateral sepals are linear to lance-shaped, {{convert|8-9|mm|in|sigfig=1|abbr=on}} long, about {{convert|2|mm|in|sigfig=1|abbr=on}} wide and separated from each other. The petals are linear in shape, about {{convert|6|mm|in|sigfig=1|abbr=on}} long and {{convert|1|mm|in|sigfig=1|abbr=on}} wide. The labellum is broadly oblong to elliptic, {{convert|5-6|mm|in|sigfig=2|abbr=on}} long, about {{convert|5|mm|in|sigfig=1|abbr=on}} wide and turns upwards at about 90° near its middle, often extending between the lateral sepals. The edge of the labellum flares widely and is wavy near its tip. There is a broad, green, fleshy, channelled callus in the centre of the labellum. Flowering occurs from October to December.[1]Taxonomy and namingPrasophyllum caudiculum was first formally described in 2000 by David Jones from a specimen collected near Guyra and the description was published in The Orchadian.[2] The specific epithet (caudiculum) is the diminutive form of the Latin word caudex meaning "stem",[3] hence "thin stem". Distribution and habitatThis leek orchid grows with grasses and herbs on the New England Tableland.[1] References1. ^1 {{cite web|last1=Weston|first1=Peter|title=Prasophyllum caudiculum|url=http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Prasophyllum~caudiculum|publisher=Royal Botanic Garden Sydney - plantnet|accessdate=4 November 2017}} 2. ^1 {{cite web|title=Prasophyllum caudiculum|url= https://id.biodiversity.org.au/instance/apni/575046|publisher=APNI|accessdate=4 November 2017}} 3. ^{{cite book|last1=Brown|first1=Roland Wilbur|title=The Composition of Scientific Words|date=1956|publisher=Smithsonian Institution Press|location=Washington, D.C.|page = 192}} GalleryExternal links
4 : Prasophyllum|Orchids of New South Wales|Endemic orchids of Australia|Plants described in 2000 |
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