| 词条 | Prasophyllum constrictum |
| 释义 |
| name = Tawny leek orchid | image = | image_caption = | status_system = | status = | taxon = Prasophyllum constrictum | authority= R.S.Rogers[1] | display_parents = 3 }}Prasophyllum constrictum, commonly known as the tawny leek orchid, is a species of orchid endemic to South Australia. It has a single tubular leaf and up to thirty five scented, brown or reddish-brown flowers with a pink or purplish labellum. Richard Sanders Rogers, who named this species, described the flowers as "prune-coloured".[2] DescriptionPrasophyllum constrictum is a terrestrial, perennial, deciduous, herb with an underground tuber and a single tube-shaped leaf, {{convert|200-600|mm|in|sigfig=1|abbr=on}} long and {{convert|3-5|mm|in|sigfig=1|abbr=on}} wide. Between ten and thirty five flowers are arranged along a flowering spike {{convert|60-90|mm|in|sigfig=1|abbr=on}} long, reaching to a height of {{convert|200-500|mm|in|sigfig=1|abbr=on}}. The flowers are scented, brown or reddish-brown, {{convert|12-15|mm|in|sigfig=1|abbr=on}} long and {{convert|5-7|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 dorsal sepal is about {{convert|7|mm|in|sigfig=1|abbr=on}} long and {{convert|3.5|mm|in|sigfig=1|abbr=on}} wide and the lateral sepals are a similar length but narrower and parallel to each other. The petals are about {{convert|6|mm|in|sigfig=1|abbr=on}} long, {{convert|1|mm|in|sigfig=1|abbr=on}} wide and curve forwards. The labellum is pink or purplish, lance-shaped to egg-shaped, {{convert|7-9|mm|in|sigfig=2|abbr=on}} long, about {{convert|4|mm|in|sigfig=2|abbr=on}} wide and turns sharply upwards at about 90° near its middle. The middle of the labellum is narrowed and the upturned part has wavy edges. There is a fleshy, shiny callus in the centre of the labellum and extending almost to its tip. Flowering occurs from October to December.[1]Taxonomy and namingPrasophyllum constrictum was first formally described in 1909 by Richard Sanders Rogers from a specimen collected near Tailem Bend and the description was published in Transactions, proceedings and report, Royal Society of South Australia.[2][3] The specific epithet (constrictum) refers to the constriction of the labellum.[4]Distribution and habitatThe tawny leek orchid grows in shrubby forest mainly in the Adelaide Hills and Mount Lofty Ranges.[1] ConservationPrasophyllum constrictum is listed as "Rare" under the South Australian National Parks and Wildlife Act 1972.[5]References1. ^1 {{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|page =206}} 2. ^1 {{cite web|title=Prasophyllum constrictum|url= https://id.biodiversity.org.au/instance/apni/507324|publisher=APNI|accessdate=18 January 2018}} 3. ^1 {{cite journal|last1=Rogers|first1=Richard S.|title=A critical review of south Australian Prasophylla together with a description of some new species.|journal=Transactions, proceedings and report, Royal Society of South Australia|date=1909|volume=33|pages=213–214|url=https://www.biodiversitylibrary.org/item/109500#page/225/mode/1up|accessdate=18 January 2018}} 4. ^{{cite web|title=Prasophyllum constrictum|url= https://id.biodiversity.org.au/instance/apni/790514|publisher=APNI|accessdate=18 January 2018}} 5. ^{{cite web|title=Threatened species of Meningie-Tailem Bend|url=http://www.naturalresources.sa.gov.au/files/assets/sa_murray-darling_basin_rap/pdfs/mtb-threatened-species-list-gen.pdf|publisher=Government of South Australia Department of Environment, Water and Natural Resources|accessdate=18 January 2018}} External links
4 : Prasophyllum|Flora of South Australia|Endemic orchids of Australia|Plants described in 1909 |
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