# Cyperus javanicus

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{{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](/source/Queensland_Government)}}</ref>
|genus = Cyperus
|species = javanicus
|authority = [Houtt.](/source/Houtt.)
|}}
thumb|''Cyperus javanicus'' inflorescence
[[File:Starr 040613-0065 Cyperus javanicus.jpg|thumb|''Cyperus javanicus'' planted in [Hawaii](/source/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](/source/USDA)|access-date=4 October 2017}}</ref> is a sedge of the family [Cyperaceae](/source/Cyperaceae) that is native to Indonesia and Australia.<ref name=FloraBase>{{FloraBase|name=''Cyperus javanicus''|id=800}}</ref>

==Description==
The [rhizomatous](/source/rhizome) 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](/source/Culm_(botany)) 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 [inflorescence](/source/inflorescence)s have between six and twelve primary rays which are up to 8&nbsp;cm {{convert|8|cm|in|1}} in length.<ref name="RFK"/>/>

==Taxonomy==
The species was first formally described by the [botanist](/source/botanist) [Martinus Houttuyn](/source/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.](/source/Jean-Baptiste_Lamarck) in 1791, ''Cyperus canescens''  [Vahl](/source/Martin_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.](/source/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](/source/Western_Australia) it is found beside pools and along streams and rivers in the [Kimberley](/source/Kimberley_(Western_Australia)) region where it grows in sandy-clay soils.<ref name=FloraBase/> The species is also endemic to the [Northern Territory](/source/Northern_Territory) and north east [Queensland](/source/Queensland) and the [Cape York Peninsula](/source/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](/source/Australian_Tropical_Rainforest_Plants) Edition 8 (RFK8) |publisher=Centre for Australian National Biodiversity Research (CANBR), [Australian Government](/source/Australian_Government)}}</ref>

It is also native to the islands north of Australia including [Papua New Guinea](/source/Papua_New_Guinea), [Timor](/source/Timor) and [Indonesia](/source/Indonesia).<ref name=at/>

The species has also been introduced into [Hawaii](/source/Hawaii) and islands in the [Pacific](/source/Pacific_Ocean) basin.<ref name=usda/>

==See also==
*[List of Cyperus species](/source/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

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Adapted from the Wikipedia article [Cyperus javanicus](https://en.wikipedia.org/wiki/Cyperus_javanicus) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Cyperus_javanicus?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.