Juncus marginatusRostk.

Bog Rushgrassleaf rush

WFO wfo-0000776849 Accepted WFO 2026-06 8 photographs CC0 / CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Juncus marginatus, photographed by Ryan Watson
fig. a Ryan Watson, CC BY 4.0 / 2021-10-12 / obs. 163126146
Juncus marginatus, photographed by Annika Lindqvist
fig. b Annika Lindqvist, CC BY 4.0 / obs. 137071193
Juncus marginatus, photographed by Sue Ann Kendall
fig. c Sue Ann Kendall, CC BY 4.0 / obs. 135548163
Juncus marginatus, photographed by Reuven Martin
fig. d Reuven Martin, CC0 1.0 / obs. 90699704
Juncus marginatus, photographed by Clay
fig. e Clay, CC BY 4.0 / obs. 49124942
Juncus marginatus, photographed by Meghan Cassidy
fig. f Meghan Cassidy, CC BY-SA 4.0 / obs. 44908596
Juncus marginatus, photographed by Sam Kieschnick
fig. g Sam Kieschnick, CC BY 4.0 / obs. 8935373
Juncus marginatus, photographed by Sam Kieschnick
fig. h Sam Kieschnick, CC BY 4.0 / obs. 4289639

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 58 botanical countries

Regions where Juncus marginatus is native: Alabama, Arizona, Arkansas, California, Colorado, 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 Hampshire, New Jersey, New Mexico, New York, North Carolina, Nova Scotia, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Québec, Rhode I., South Carolina, South Dakota, Tennessee, Texas, Vermont, Virginia, West Virginia, Wisconsin, Bermuda, Bolivia, Brazil North, Cuba, Honduras, Jamaica, Venezuela AlabamaArizonaArkansasCaliforniaColoradoConnecticutFloridaGeorgiaIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMexico CentralMexico GulfMexico NortheastMexico NorthwestMexico SoutheastMexico SouthwestMichiganMinnesotaMississippiMissouriNebraskaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNova ScotiaOhioOklahomaOntarioOregonPennsylvaniaQuébecSouth CarolinaSouth DakotaTennesseeTexasVermontVirginiaWest VirginiaWisconsinBoliviaBrazil NorthCubaHondurasJamaicaVenezuela DelawareDistrict of ColumbiaRhode I.Bermuda
Native distribution of Juncus marginatus, 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 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 Hampshire NWH
New Jersey NWJ
New Mexico NWM
New York NWY
North Carolina NCA
Nova Scotia NSC
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
Vermont VER
Virginia VRG
West Virginia WVA
Wisconsin WIS
Bermuda BER SOUTHERN AMERICA
Bolivia BOL
Brazil North BZN
Cuba CUB
Honduras HON
Jamaica JAM
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.

Where it actually grows measured, from 681 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -7.3 °C 3.9 °C 11.2 °C
Warmest month, mean daily high 25.9 °C 33.5 °C 35.0 °C
Annual rainfall 869 mm 1,162 mm 1,603 mm
Rainfall in the driest quarter 133 mm 205 mm 324 mm

It is found where winters bring hard frost. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 681 research-grade observations of Juncus marginatus 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 21 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.

  • Juncus aristulatus Michx.
  • Juncus aristulatus var. pinetorum Coville
  • Juncus buchenaui Sved.
  • Juncus canaliculatus Liebm.
  • Juncus cylindricus M.A.Curtis
  • Juncus heteranthos Nutt.
  • Juncus heteranthus Nutt.
  • Juncus marginatus var. aristulatus (Michx.) Coville
  • Juncus marginatus var. biflorus (Elliott) Engelm.
  • Juncus marginatus var. marginatus
  • Juncus marginatus var. odoratus Torr.
  • Juncus marginatus var. paucicapitatus Engelm.
  • Juncus marginatus var. setosus Coville
  • Juncus marginatus var. vulgaris Engelm.
  • Juncus odoratus Steud.
  • Juncus setosus (Coville) Small
  • Luzula angustifolia Poir.
  • Luzula juncoides Poir.
  • Tristemon laxus Raf.
  • Tristemon marginatus (Rostk.) Raf.
  • Tristemon odoratus Raf.

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.