Dulichium arundinaceum(L.) Britton

Three way sedgethreeway sedgethree-way sedge

WFO wfo-0000398654 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Dulichium arundinaceum, photographed by Steven Lamonde
fig. a Steven Lamonde, CC BY 4.0 / 2022-06-04 / obs. 205864610
Dulichium arundinaceum, photographed by Lynn Harper
fig. b Lynn Harper, CC0 1.0 / obs. 201716813
Dulichium arundinaceum, photographed by Ryan Watson
fig. c Ryan Watson, CC BY 4.0 / obs. 183964085
Dulichium arundinaceum, photographed by Zac Peterson
fig. d Zac Peterson, CC BY 4.0 / obs. 172955178
Dulichium arundinaceum, photographed by Steven Lamonde
fig. e Steven Lamonde, CC BY 4.0 / obs. 164544241
Dulichium arundinaceum, photographed by botanygirl
fig. f botanygirl, CC BY 4.0 / obs. 175286177
Dulichium arundinaceum, photographed by Mary E. Macaulay, P.Eng.
fig. g Mary E. Macaulay, P.Eng., CC BY 4.0 / obs. 160936835
Dulichium arundinaceum, photographed by Lynn Harper
fig. h Lynn Harper, CC0 1.0 / obs. 158210779

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 48 botanical countries

Regions where Dulichium arundinaceum is native: Alabama, Arkansas, British Columbia, California, Connecticut, Delaware, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kentucky, Louisiana, Maine, Manitoba, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Brunswick, New Hampshire, New Jersey, New York, Newfoundland, North Carolina, Nova Scotia, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Prince Edward I., Québec, Rhode I., South Carolina, Tennessee, Texas, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming AlabamaArkansasBritish ColumbiaCaliforniaConnecticutFloridaGeorgiaIdahoIllinoisIndianaIowaKentuckyLouisianaMaineManitobaMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNew BrunswickNew HampshireNew JerseyNew YorkNewfoundlandNorth CarolinaNova ScotiaOhioOklahomaOntarioOregonPennsylvaniaPrince Edward I.QuébecSouth CarolinaTennesseeTexasVermontVirginiaWashingtonWest VirginiaWisconsinWyoming DelawareRhode I.
Native distribution of Dulichium arundinaceum, 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
Arkansas ARK
British Columbia BRC
California CAL
Connecticut CNT
Delaware DEL
Florida FLA
Georgia GEO
Idaho IDA
Illinois ILL
Indiana INI
Iowa IOW
Kentucky KTY
Louisiana LOU
Maine MAI
Manitoba MAN
Maryland MRY
Massachusetts MAS
Michigan MIC
Minnesota MIN
Mississippi MSI
Missouri MSO
Montana MNT
Nebraska NEB
New Brunswick NBR
New Hampshire NWH
New Jersey NWJ
New York NWY
Newfoundland NFL
North Carolina NCA
Nova Scotia NSC
Ohio OHI
Oklahoma OKL
Ontario ONT
Oregon ORE
Pennsylvania PEN
Prince Edward I. PEI
Québec QUE
Rhode I. RHO
South Carolina SCA
Tennessee TEN
Texas TEX
Vermont VER
Virginia VRG
Washington WAS
West Virginia WVA
Wisconsin WIS
Wyoming WYO

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.

Flowering 202 in flower of 378 examined

Peak flowering in Jul. Each bar is the share of Dulichium arundinaceum observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 202 of 378 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 7 months have fewer than 5 examined observations, so no proportion is drawn for them. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.

Also published as 11 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.

  • Cyperus arundinaceus L.
  • Cyperus ferrugineus L.
  • Cyperus spathaceus (L.) L.
  • Dulichium canadense Rich.
  • Dulichium spathaceum (L.) Rich.
  • Dulichium spathaceum var. humilius Hook.
  • Schoenus angustifolius Vahl
  • Schoenus spathaceus L.
  • Scirpus spathaceus (L.) Michx.
  • Scirpus tegetalis Burch.
  • Sparganium trifidum Poir.

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.