Cyperus bipartitusTorr.

slender flatsedge

WFO wfo-0000368659 Accepted WFO 2026-06 8 photographs CC0 / CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Cyperus bipartitus, photographed by Henry "Nick" Robertson
fig. a Henry "Nick" Robertson, CC BY-SA 4.0 / 2021-09-06 / obs. 155752469
Cyperus bipartitus, photographed by Quinten Wiegersma
fig. b Quinten Wiegersma, CC BY 4.0 / obs. 152587765
Cyperus bipartitus, photographed by Allan Harris
fig. c Allan Harris, CC0 1.0 / obs. 152563577
Cyperus bipartitus, photographed by Allan Harris
fig. d Allan Harris, CC0 1.0 / obs. 152010318
Cyperus bipartitus, photographed by Ryan Sorrells
fig. e Ryan Sorrells, CC BY 4.0 / obs. 151666854
Cyperus bipartitus, photographed by Quinten Wiegersma
fig. f Quinten Wiegersma, CC BY 4.0 / obs. 150688121
Cyperus bipartitus, photographed by Henry "Nick" Robertson
fig. g Henry "Nick" Robertson, CC BY-SA 4.0 / obs. 150178585
Cyperus bipartitus, photographed by Norma Malinowski
fig. h Norma Malinowski, CC BY 4.0 / obs. 148730808

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Native range 67 botanical countries

Regions where Cyperus bipartitus is native: Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Mexico Gulf, Mexico Northeast, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Québec, Rhode I., South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Argentina Northeast, Argentina Northwest, Bolivia, Chile North, Colombia, Costa Rica, Ecuador, El Salvador, Galápagos, Guatemala, Honduras, Nicaragua, Panamá, Peru, Venezuela AlabamaArizonaArkansasCaliforniaColoradoConnecticutFloridaGeorgiaIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMexico GulfMexico NortheastMexico SoutheastMexico SouthwestMichiganMinnesotaMississippiMissouriNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOntarioOregonPennsylvaniaQuébecSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashingtonWest VirginiaWisconsinArgentina NortheastArgentina NorthwestBoliviaChile NorthColombiaCosta RicaEcuadorEl SalvadorGuatemalaHondurasNicaraguaPanamáPeruVenezuela DelawareDistrict of ColumbiaRhode I.Galápagos
Native distribution of Cyperus bipartitus, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows. Regions too small to draw at this scale are marked with a dot.
RegionTDWG codeContinent
Alabama ALA NORTHERN AMERICA
Arizona ARI
Arkansas ARK
California CAL
Colorado COL
Connecticut CNT
Delaware DEL
District of Columbia WDC
Florida FLA
Georgia GEO
Illinois ILL
Indiana INI
Iowa IOW
Kansas KAN
Kentucky KTY
Louisiana LOU
Maine MAI
Maryland MRY
Massachusetts MAS
Mexico Gulf MXG
Mexico Northeast MXE
Mexico Southeast MXT
Mexico Southwest MXS
Michigan MIC
Minnesota MIN
Mississippi MSI
Missouri MSO
Nebraska NEB
Nevada NEV
New Hampshire NWH
New Jersey NWJ
New Mexico NWM
New York NWY
North Carolina NCA
North Dakota NDA
Ohio OHI
Oklahoma OKL
Ontario ONT
Oregon ORE
Pennsylvania PEN
Québec QUE
Rhode I. RHO
South Carolina SCA
South Dakota SDA
Tennessee TEN
Texas TEX
Utah UTA
Vermont VER
Virginia VRG
Washington WAS
West Virginia WVA
Wisconsin WIS
Argentina Northeast AGE SOUTHERN AMERICA
Argentina Northwest AGW
Bolivia BOL
Chile North CLN
Colombia CLM
Costa Rica COS
Ecuador ECU
El Salvador ELS
Galápagos GAL
Guatemala GUA
Honduras HON
Nicaragua NIC
Panamá PAN
Peru PER
Venezuela VEN

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Also published as 30 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Chlorocyperus rivularis (Kunth) Rikli
  • Cyperus angustifolius A.Dietr.
  • Cyperus argentinus C.B.Clarke
  • Cyperus bicolor Barton
  • Cyperus bigelowii Steud.
  • Cyperus bipartitus f. elongatus (Boeckeler) Mohlenbr.
  • Cyperus bipartitus f. elutus (C.B.Clarke) Mohlenbr.
  • Cyperus castaneus Bigelow
  • Cyperus diandrus var. bipartitus (Torr.) Kük.
  • Cyperus diandrus var. castaneus (Pursh) Torr.
  • Cyperus flavescens var. bicolor Farw.
  • Cyperus flavescens var. castaneus Pursh
  • Cyperus lagunetto Steud.
  • Cyperus niger var. rivularis (Kunth) V.E.Grant
  • Cyperus pauper Phil.
  • Cyperus rivularis Kunth
  • Cyperus rivularis f. acutatus (C.B.Clarke) Kük.
  • Cyperus rivularis f. depauperatus (C.B.Clarke) Kük.
  • Cyperus rivularis f. elutus (C.B.Clarke) Kük.
  • Cyperus rivularis f. subacaulis Kük.
  • Cyperus rivularis subsp. lagunetto (Steud.) Kük.
  • Cyperus rivularis var. acutatus C.B.Clarke
  • Cyperus rivularis var. depauperatus C.B.Clarke
  • Cyperus rivularis var. elongatus Boeckeler

and 6 more.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.