A rhizomatous perennial of shallow water or wet ground at the edges of rivers, streams, canals, lakes and ponds, in swamps, ditches and unimproved flood meadows and in marshland. It usually grows in calcareous and mesotrophic or eutrophic conditions, in areas subject to frequent flooding. It is shade-tolerant and sometimes grows under riverside trees or in wet woodland. Lowland, but formerly at 335 m at Greystoke (Cumberland).
C. acuta, though now better recorded than for the 1962 Atlas, has declined in many areas, principally because of drainage and canalisation of rivers and streams.
Eurosiberian Boreo-temperate element.
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Light (Ellenberg): 7
Moisture (Ellenberg): 9
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 5
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.5
July Mean Temperature (Celsius): 15.5
Annual Precipitation (mm): 830
Height (cm): 120
Perennation - primary
Life Form - primary
Life Form - secondary
Clonality - primary
Count of 10km squares in Great Britain: 707
Count of 10km squares in Ireland: 87
Count of 10km squares in the Channel Isles: 0
Atlas Change Index: -0.46
Weighted Changed Factor: 26
Weighted Change Factor Confidence (90%)
Atlas text references
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
1982. Sedges of the British Isles. Botanical Society of the British Isles Handbook no. 1, edn 2.
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.
1997. Aquatic plants in Britain and Ireland.