Juncus conglomeratusL.

Compact Rushclustered rush

WFO wfo-0000776253 Accepted WFO 2026-06 8 photographs CC0 / CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Juncus conglomeratus, photographed by Tim Johnson
fig. a Tim Johnson, CC BY 4.0 / 2022-05-26 / obs. 202888112
Juncus conglomeratus, photographed by Josep Gesti
fig. b Josep Gesti, CC BY-SA 4.0 / obs. 198896070
Juncus conglomeratus, photographed by Stephen James McWilliam
fig. c Stephen James McWilliam, CC0 1.0 / obs. 194829850
Juncus conglomeratus, photographed by Susan Marley
fig. d Susan Marley, CC BY 4.0 / obs. 194663268
Juncus conglomeratus, photographed by Марина Садыкова
fig. e Марина Садыкова, CC BY 4.0 / obs. 150973755
Juncus conglomeratus, photographed by Michel Langeveld
fig. f Michel Langeveld, CC BY 4.0 / obs. 145658457
Juncus conglomeratus, photographed by Stephen James McWilliam
fig. g Stephen James McWilliam, CC0 1.0 / obs. 142863737
Juncus conglomeratus, photographed by Stephen James McWilliam
fig. h Stephen James McWilliam, CC0 1.0 / obs. 148748290

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 44 botanical countries

Regions where Juncus conglomeratus is native: Algeria, Morocco, Tunisia, Iraq, North Caucasus, Transcaucasus, Türkiye, West Siberia, Austria, Baltic States, Belarus, Belgium, Bulgaria, Central European Russia, Corse, Czechia-Slovakia, Denmark, East European Russia, Finland, Føroyar, France, Germany, Great Britain, Greece, Hungary, Ireland, Italy, Krym, Netherlands, North European Russia, Northwest European Russia, Norway, NW. Balkan Pen., Poland, Portugal, Romania, Sardegna, Sicilia, South European Russia, Spain, Sweden, Switzerland, Türkiye-in-Europe, Ukraine AlgeriaMoroccoTunisiaIraqNorth CaucasusTranscaucasusTürkiyeWest SiberiaAustriaBaltic StatesBelarusBelgiumBulgariaCentral European RussiaCorseCzechia-SlovakiaDenmarkEast European RussiaFinlandFranceGermanyGreeceHungaryIrelandItalyKrymNetherlandsNorth European RussiaNorthwest European RussiaNorwayNW. Balkan Pen.PolandPortugalRomaniaSiciliaSouth European RussiaSpainSwedenSwitzerlandTürkiye-in-EuropeUkraine FøroyarSardegna
Native distribution of Juncus conglomeratus, 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
Austria AUT EUROPE
Baltic States BLT
Belarus BLR
Belgium BGM
Bulgaria BUL
Central European Russia RUC
Corse COR
Czechia-Slovakia CZE
Denmark DEN
East European Russia RUE
Finland FIN
Føroyar FOR
France FRA
Germany GER
Great Britain GRB
Greece GRC
Hungary HUN
Ireland IRE
Italy ITA
Krym KRY
Netherlands NET
North European Russia RUN
Northwest European Russia RUW
Norway NOR
NW. Balkan Pen. YUG
Poland POL
Portugal POR
Romania ROM
Sardegna SAR
Sicilia SIC
South European Russia RUS
Spain SPA
Sweden SWE
Switzerland SWI
Türkiye-in-Europe TUE
Ukraine UKR
Iraq IRQ ASIA-TEMPERATE
North Caucasus NCS
Transcaucasus TCS
Türkiye TUR
West Siberia WSB
Algeria ALG AFRICA
Morocco MOR
Tunisia TUN

Not drawn on the map: Great Britain. We hold no public-domain boundary for this region, so it is listed rather than guessed at.

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 1,999 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -12.2 °C -2.0 °C 4.0 °C
Warmest month, mean daily high 16.9 °C 20.9 °C 25.0 °C
Annual rainfall 586 mm 822 mm 1,629 mm
Rainfall in the driest quarter 96 mm 151 mm 296 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 1,999 research-grade observations of Juncus conglomeratus 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 37 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 communis prol. conglomeratus (L.) Rouy
  • Juncus communis subsp. conglomeratus (L.) Čelak.
  • Juncus communis subsp. conglomeratus Bonnier & Layens
  • Juncus communis subvar. viridiflorus (Buchenau) Rouy
  • Juncus communis var. conglomeratus C.Moore & Betche
  • Juncus communis var. conglomeratus (L.) E.Mey.
  • Juncus conglomeratus subsp. subuliflorus (Drejer) Nyman
  • Juncus conglomeratus unranked laxus (Beck) Asch. & Graebn.
  • Juncus conglomeratus unranked subuliflorus (Drejer) Asch. & Graebn.
  • Juncus conglomeratus unranked typicus Asch. & Graebn.
  • Juncus conglomeratus unranked umbrosus Asch. & Graebn.
  • Juncus conglomeratus unranked viridiflorus (Buchenau) Asch. & Graebn.
  • Juncus conglomeratus var. altissimus Klett & Richt.
  • Juncus conglomeratus var. ingens Merino
  • Juncus conglomeratus var. laxus (Beck) I.Grinț.
  • Juncus conglomeratus var. umbrosus (Asch. & Graebn.) I.Grint.
  • Juncus effusus f. conglomeratus (L.) Reichgelt
  • Juncus effusus f. conglomeratus (L.) Reichg.
  • Juncus effusus f. conglomeratus (L.) Neuman
  • Juncus effusus subsp. conglomeratus (L.) Husn.
  • Juncus effusus var. conglomeratus (L.) Bosch
  • Juncus glomeratus Thunb.
  • Juncus laevis var. conglomeratus (L.) Wallr.
  • Juncus leersii T.Marsson

and 13 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.