Bulbostylis capillaris(L.) Kunth ex C.B.Clarke

Densetuft HairsedgeThreadleaf Beakseeddensetuft hairsedge

WFO wfo-0000342104 Accepted WFO 2026-06 8 photographs CC0 / CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Bulbostylis capillaris, photographed by Cecelia Alexander
fig. a Cecelia Alexander, CC0 1.0 / 2021-09-19 / obs. 158431274

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 71 botanical countries

Regions where Bulbostylis capillaris is native: Alabama, Arizona, Arkansas, California, Connecticut, Delaware, District of Columbia, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Nebraska, New Brunswick, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Nova Scotia, Ohio, Oklahoma, Ontario, Pennsylvania, Québec, Rhode I., South Carolina, Tennessee, Texas, Vermont, Virginia, West Virginia, Wisconsin, Belize, Bolivia, Brazil North, Brazil Southeast, Brazil West-Central, Colombia, Cuba, Dominican Republic, Ecuador, French Guiana, Guatemala, Guyana, Honduras, Jamaica, Nicaragua, Peru, Puerto Rico, Suriname, Trinidad-Tobago, Venezuela, Venezuelan Antilles, Windward Is. AlabamaArizonaArkansasCaliforniaConnecticutFloridaGeorgiaIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMexico CentralMexico GulfMexico NortheastMexico NorthwestMexico SoutheastMexico SouthwestMichiganMinnesotaMississippiMissouriNebraskaNew BrunswickNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNova ScotiaOhioOklahomaOntarioPennsylvaniaQuébecSouth CarolinaTennesseeTexasVermontVirginiaWest VirginiaWisconsinBelizeBoliviaBrazil NorthBrazil SoutheastBrazil West-CentralColombiaCubaDominican RepublicEcuadorFrench GuianaGuatemalaGuyanaHondurasJamaicaNicaraguaPeruPuerto RicoSurinameTrinidad-TobagoVenezuela DelawareDistrict of ColumbiaRhode I.Venezuelan AntillesWindward Is.
Native distribution of Bulbostylis capillaris, 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
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 Central MXC
Mexico Gulf MXG
Mexico Northeast MXE
Mexico Northwest MXN
Mexico Southeast MXT
Mexico Southwest MXS
Michigan MIC
Minnesota MIN
Mississippi MSI
Missouri MSO
Nebraska NEB
New Brunswick NBR
New Hampshire NWH
New Jersey NWJ
New Mexico NWM
New York NWY
North Carolina NCA
Nova Scotia NSC
Ohio OHI
Oklahoma OKL
Ontario ONT
Pennsylvania PEN
Québec QUE
Rhode I. RHO
South Carolina SCA
Tennessee TEN
Texas TEX
Vermont VER
Virginia VRG
West Virginia WVA
Wisconsin WIS
Belize BLZ SOUTHERN AMERICA
Bolivia BOL
Brazil North BZN
Brazil Southeast BZL
Brazil West-Central BZC
Colombia CLM
Cuba CUB
Dominican Republic DOM
Ecuador ECU
French Guiana FRG
Guatemala GUA
Guyana GUY
Honduras HON
Jamaica JAM
Nicaragua NIC
Peru PER
Puerto Rico PUE
Suriname SUR
Trinidad-Tobago TRT
Venezuela VEN
Venezuelan Antilles VNA
Windward Is. WIN

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.

Where it actually grows measured, from 516 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -15.3 °C -6.4 °C 14.4 °C
Warmest month, mean daily high 20.8 °C 25.5 °C 31.6 °C
Annual rainfall 819 mm 1,236 mm 3,395 mm
Rainfall in the driest quarter 67 mm 266 mm 573 mm

It is found where winters are severely cold. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 516 research-grade observations of Bulbostylis capillaris that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.

Also published as 57 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.

  • Abildgaardia capillaris (L.) Lye
  • Bulbostylis antillana (Britton) Fernald
  • Bulbostylis capillaris f. minima (Maury) R.Knuth
  • Bulbostylis capillaris subsp. major Uittien
  • Bulbostylis capillaris var. capillaris
  • Bulbostylis capillaris var. crebra Fernald
  • Bulbostylis capillaris var. genuina Osten
  • Bulbostylis capillaris var. isopoda Fernald
  • Bulbostylis capillaris var. major (Maury) R.Knuth
  • Bulbostylis capillaris var. microstachys (Boeckeler) Barros
  • Bulbostylis capillaris var. pyriformis C.B.Clarke ex Lindm.
  • Bulbostylis ciliata (J.Presl & C.Presl) Nees ex B.D.Jacks.
  • Bulbostylis schraderiana (Steud.) Beetle
  • Bulbostylis trichoides (Schrad. ex Schult.) Beetle
  • Cyperus minimus L.
  • Cyperus pubescens Steud.
  • Cyperus pubifolius Steud.
  • Fimbristylis capillaris (L.) A.Gray
  • Fimbristylis capillaris f. major Maury
  • Fimbristylis capillaris f. minima Maury
  • Fimbristylis capillaris var. major Maury
  • Fimbristylis coarctata Schwein.
  • Fimbristylis tenella Raddi
  • Iria capillaris (L.) Kuntze

and 33 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.