| 词条 | Habenaria ochroleuca |
| 释义 |
| name = Sickle orchid | image = | image_caption = | status = | status_system = | display_parents = 4 | genus = Habenaria | species = ochroleuca | authority = R.Br.[1] | synonyms = Habenaria eurystoma Schltr. }} Habenaria ochroleuca, commonly known as the sickle orchid[2] or sickle habenaria,[3] is a species of orchid that is endemic to northern Australia. It has two or three broad, glabrous leaves and up to twenty five white flowers on a flowering stem with many overlapping bracts. The side lobes of the labellum curve upwards. DescriptionHabenaria ochroleuca is a tuberous, perennial herb with two or three glabrous leaves {{convert|80-100|mm|in|sigfig=1|abbr=on}} long and {{convert|10-12|mm|in|sigfig=1|abbr=on}} wide. There are between ten and twenty five flowers on a wiry flowering stem {{convert|250-400|mm|in|sigfig=1|abbr=on}} high with many overlapping bracts. The bracts are {{convert|20-50|mm|in|sigfig=1|abbr=on}} long and {{convert|3-8|mm|in|sigfig=1|abbr=on}} wide and the flowers are {{convert|10-13|mm|in|sigfig=1|abbr=on}} long and {{convert|12-14|mm|in|sigfig=1|abbr=on}} wide. The dorsal sepal is about {{convert|5|mm|in|sigfig=2|abbr=on}} long and {{convert|3|mm|in|sigfig=1|abbr=on}} wide. The lateral sepals are about {{convert|6|mm|in|sigfig=2|abbr=on}} long, {{convert|3|mm|in|sigfig=1|abbr=on}} wide and are held behind the side lobes of the labellum. The petals are about {{convert|5|mm|in|sigfig=1|abbr=on}} long, {{convert|1.5|mm|in|sigfig=1|abbr=on}} wide and curve upwards beside the dorsal sepal. The labellum has three lobes, the side lobes are about {{convert|4.5|mm|in|sigfig=1|abbr=on}} long, {{convert|1.5|mm|in|sigfig=1|abbr=on}} long and curve upwards. The middle lobe is about {{convert|3.5|mm|in|sigfig=1|abbr=on}} long and curves downwards towards the ovary. The nectary spur is also curved, {{convert|10-11|mm|in|sigfig=2|abbr=on}} long and about {{convert|2|mm|in|sigfig=1|abbr=on}} wide. Flowering occurs from January to March.[2][3][4]Taxonomy and namingHabenaria ochroleuca was first formally described in 1810 by Robert Brown and the description was published in Prodromus Florae Novae Hollandiae et Insulae Van Diemen.[5][6] The specific epithet (ochroleuca) is derived from the Ancient Greek words ochros meaning "pale-yellow", "sallow" or "wan"[7]{{rp|872}} and leukos meaning "white"[7]{{rp|856}} referring to the colour of the flowers.[3]Distribution and habitatThe sickle orchid is found in the Kimberley region of Western Australia, in the northern parts of the Northern Territory and in New Guinea. It is common within its range in Western Australia where it grows in seasonally wet areas and on roadsides.[2][3][4] ConservationHabenaria ochroleuca is classified as "not threatened" in Western Australia by the Western Australian Government Department of Parks and Wildlife.[8]References1. ^{{WCSP | 95243 | Habenaria ochroleuca }} {{Taxonbar|from= Q15482493}}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|page =343}} 3. ^1 2 3 {{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=496}} 4. ^1 {{cite web |title=Habenaria ochroleuca |url=http://www.orchidsnewguinea.com/orchid-information/species/speciescode/2182 |publisher=Orchids of New Guinea |accessdate=28 August 2018}} 5. ^{{cite web|title=Habenaria ochroleuca|url= https://id.biodiversity.org.au/instance/apni/536559|publisher=APNI|accessdate=28 August 2018}} 6. ^{{cite book |last1=Brown |first1=Robert |title=Prodromus florae Novae Hollandiae |date=1810 |location=London |page=313 |url=https://www.biodiversitylibrary.org/item/21771#page/183/mode/1up |accessdate=28 August 2018}} 7. ^1 {{cite book|last1=Brown|first1=Roland Wilbur|title=The Composition of Scientific Words|date=1956|publisher=Smithsonian Institution Press|location=Washington, D.C.}} 8. ^{{FloraBase|name=Habenaria ochroleuca|id=1652}} 7 : Orchids of the Northern Territory|Orchids of Western Australia|Orchids of New Guinea|Endemic orchids of Australia|Plants described in 1810|Orchideae genera|Habenaria |
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