Juncus articulatus

Tracheophyta MagnoliopsidaJuncaceaeJuncusJuncus articulatus


This very variable, erect to decumbent, clumped to extensively rhizomatous herb is found in a wide range of wet or damp habitats, both freshwater and brackish. It is characteristic of damp fields, marshes, ditches, flushes, rutted woodland rides, margins of ponds, lakes and streams and dune-slacks, avoiding only the most acid soils. 0-810 m (Great Dun Fell, Westmorland).



World Distribution

Eurosiberian Southern-temperate element, but widely naturalised so that distribution is now Circumpolar Southern-temperate.

© M. Cotterill, IWNHAS

Broad Habitats

Fen, marsh and swamp (not wooded)

Light (Ellenberg): 8

Moisture (Ellenberg): 9

Reaction (Ellenberg): 6

Nitrogen (Ellenberg): 3

Salt Tolerance (Ellenberg): 1

January Mean Temperature (Celsius): 3.5

July Mean Temperature (Celsius): 14.4

Annual Precipitation (mm): 1108

Height (cm): 60

Perennation - primary


Life Form - primary




Clonality - primary

Rhizome far-creeping

Count of 10km squares in Great Britain: 2740

Count of 10km squares in Ireland: 956

Count of 10km squares in the Channel Isles: 11

Atlas Change Index: 1.26

Weighted Changed Factor: 17

Weighted Change Factor Confidence (90%)


JNCC Designations


Atlas text references

Atlas (321c)
Grime JP, Hodgson JG, Hunt R
1988.  Comparative Plant Ecology.
Hultén E, Fries M
1986.  Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Meusel H, Jäger E, Weinert E
1965.  Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.