A rhizomatous, clump-forming perennial herb of saltmarshes and saline dune-slacks. It also occurs in areas subject to freshwater seepage on low, exposed rocky cliff-tops and stony sea-loch shores. It is tolerant of a wide range of salinities and soil moisture, occurring at all levels in saltmarshes and in both silty and sandy substrates. Lowland.
J. maritimus has been lost since the 1962 Atlas from a number of sites on the S. and E. coasts of England, but the distribution is stable elsewhere.
European Southern-temperate element; widely naturalised outside its native range.
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Light (Ellenberg): 8
Moisture (Ellenberg): 8
Reaction (Ellenberg): 8
Nitrogen (Ellenberg): 5
Salt Tolerance (Ellenberg): 5
January Mean Temperature (Celsius): 4.7
July Mean Temperature (Celsius): 15.1
Annual Precipitation (mm): 1081
Height (cm): 100
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 390
Count of 10km squares in Ireland: 196
Count of 10km squares in the Channel Isles: 11
Atlas Change Index: -0.26
Weighted Changed Factor: 5
Weighted Change Factor Confidence (90%)
Atlas text references
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.
1993. A revision of Juncus subgen. Juncus (Juncaceae). Willdenowia. 23:23-73.