{{Short description|Species of plant}} {{speciesbox |name = Javanese flatsedge |image = Cyperus javanicus (4766436337).jpg |image_caption = ''Cyperus javanicus'' habit and inflorescence |status = LC |status_system = QLDNCA |status_ref = <ref name="DESQLD">{{cite web |access-date=11 June 2021 |url=https://apps.des.qld.gov.au/species-search/details/?id=17525 |title=Species profile—''Cyperus javanicus'' |website=Queensland Department of Environment and Science |publisher=Queensland Government}}</ref> |genus = Cyperus |species = javanicus |authority = Houtt. |}} thumb|''Cyperus javanicus'' inflorescence [[File:Starr 040613-0065 Cyperus javanicus.jpg|thumb|''Cyperus javanicus'' planted in Hawaii]]
'''''Cyperus javanicus''''', also known as the '''Javanese flatsedge''',<ref name=usda>{{cite web|url=http://plants.usda.gov/plant-profile?symbol=cyja|title=Cyperus javanicus Houtt. Javanese flatsedge|work=Plants Database|publisher=USDA|access-date=4 October 2017}}</ref> is a sedge of the family Cyperaceae that is native to Indonesia and Australia.<ref name=FloraBase>{{FloraBase|name=''Cyperus javanicus''|id=800}}</ref>
==Description== The rhizomatous glaucous perennial sedge typically grows to a height of {{convert|0.6|to|1.2|m|ft|1}} and has a tufted habit. The plant blooms between January and August producing brown flowers.<ref name=FloraBase/> The culms are obtusely trigonous and densely papillose. The leaves are long and flat on top while folded at the base and around {{convert|2|to|13|mm|in|2}} in width. The compound inflorescences have between six and twelve primary rays which are up to 8 cm {{convert|8|cm|in|1}} in length.<ref name="RFK"/>/>
==Taxonomy== The species was first formally described by the botanist Martinus Houttuyn in 1782 in the work ''Natuurlijke Histoire of Uitvoerige Beschryving der Dieren, Planten en Mineraalen''. Several synonyms have been described including: ''Cyperus pennatus'' Lam. in 1791, ''Cyperus canescens'' Vahl in 1805, ''Cyperus javanicus'' subsp. ''armstrongii'' Dunlop in 1987, ''Mariscus pennatus'' (Lam.) Domin in 1915, ''Cyperus ventricosus'' R.Br. in 1810 and ''Mariscus albescens'' Gaudich. in 1829.<ref name=at>{{cite web|url=http://bie.ala.org.au/species/http://id.biodiversity.org.au/node/apni/2914573#names|title=Cyperus javanicus Houtt.|accessdate=4 October 2017|work=Atlas of Living Australia|publisher=Global Biodiversity Information Facility}}</ref> ==Distribution== In Western Australia it is found beside pools and along streams and rivers in the Kimberley region where it grows in sandy-clay soils.<ref name=FloraBase/> The species is also endemic to the Northern Territory and north east Queensland and the Cape York Peninsula.<ref name="RFK">{{cite web |author1=F.A.Zich |author2=B.P.M.Hyland |author3=T.Whiffen |author4=R.A.Kerrigan |author2-link=Bernard Hyland |year=2020 |access-date=11 June 2021 |url=https://apps.lucidcentral.org/rainforest/text/entities/Cyperus_javanicus.htm |title=''Cyperus javanicus'' |website=Australian Tropical Rainforest Plants Edition 8 (RFK8) |publisher=Centre for Australian National Biodiversity Research (CANBR), Australian Government}}</ref>
It is also native to the islands north of Australia including Papua New Guinea, Timor and Indonesia.<ref name=at/>
The species has also been introduced into Hawaii and islands in the Pacific basin.<ref name=usda/>
==See also== *List of Cyperus species
==References== {{Reflist}}
{{Taxonbar|from=Q3008826}}
Category:Plants described in 1782 Category:Flora of Western Australia Category:Flora of Queensland Category:Flora of the Northern Territory javanicus Category:Taxa named by Martinus Houttuyn