Juncus diffusissimusBuckley

slimpod rush

WFO wfo-0000776309 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Juncus diffusissimus, photographed by Bonnie Semmling
fig. a Bonnie Semmling, CC BY 4.0 / 2022-05-31 / obs. 202429977
Juncus diffusissimus, photographed by Bonnie Semmling
fig. b Bonnie Semmling, CC BY 4.0 / obs. 202367070
Juncus diffusissimus, photographed by Sam Kieschnick
fig. c Sam Kieschnick, CC BY 4.0 / obs. 4184191
Juncus diffusissimus, photographed by Sam Kieschnick
fig. d Sam Kieschnick, CC BY 4.0 / obs. 1439438
Juncus diffusissimus, photographed by Joseph McPhail
fig. e Joseph McPhail, CC BY 4.0 / obs. 205233595
Juncus diffusissimus, photographed by Joseph McPhail
fig. f Joseph McPhail, CC BY 4.0 / obs. 205137043
Juncus diffusissimus, photographed by Joseph McPhail
fig. g Joseph McPhail, CC BY 4.0 / obs. 205015274
Juncus diffusissimus, photographed by John Kees
fig. h John Kees, CC0 1.0 / obs. 202097106

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 23 botanical countries

Regions where Juncus diffusissimus is native: Alabama, Arkansas, Connecticut, Florida, Georgia, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maryland, Mississippi, Missouri, New York, North Carolina, Ohio, Oklahoma, South Carolina, South Dakota, Tennessee, Texas, Virginia, West Virginia AlabamaArkansasConnecticutFloridaGeorgiaIllinoisIndianaKansasKentuckyLouisianaMarylandMississippiMissouriNew YorkNorth CarolinaOhioOklahomaSouth CarolinaSouth DakotaTennesseeTexasVirginiaWest Virginia
Native distribution of Juncus diffusissimus, 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.
RegionTDWG codeContinent
Alabama ALA NORTHERN AMERICA
Arkansas ARK
Connecticut CNT
Florida FLA
Georgia GEO
Illinois ILL
Indiana INI
Kansas KAN
Kentucky KTY
Louisiana LOU
Maryland MRY
Mississippi MSI
Missouri MSO
New York NWY
North Carolina NCA
Ohio OHI
Oklahoma OKL
South Carolina SCA
South Dakota SDA
Tennessee TEN
Texas TEX
Virginia VRG
West Virginia WVA

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 153 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -3.9 °C 2.7 °C 8.2 °C
Warmest month, mean daily high 27.6 °C 32.6 °C 34.8 °C
Annual rainfall 946 mm 1,274 mm 1,699 mm
Rainfall in the driest quarter 172 mm 249 mm 347 mm

It is found where winters bring light 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 153 research-grade observations of Juncus diffusissimus 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 1 synonym

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 acuminatus var. diffusissimus (Buckley) Engelm.

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.