A pioneer species of wet mud and shallow water, found in a wide variety of habitats including the edges of lakes, ponds, reservoirs, rivers, ditches, canals and backwaters. It also occurs in reedswamps and tall-herb fens, and readily colonises sand-, gravel-, clay- and marl-pits. It is shade-tolerant, and is found in swampy Alnus woods and Salix carr. Reproduction is by seed. Lowland.
C. pseudocyperus was lost from many squares in Ireland before 1930. It has declined across much of its British range, but particularly in S.E. and E. England, since the 1962 Atlas. It is sometimes planted at the edge of ponds.
Eurosiberian Temperate element; also in E. Asia and N. America.
Light (Ellenberg): 7
Moisture (Ellenberg): 9
Reaction (Ellenberg): 6
Nitrogen (Ellenberg): 6
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.8
July Mean Temperature (Celsius): 16
Annual Precipitation (mm): 754
Height (cm): 90
Perennation - primary
Life Form - primary
Life Form - secondary
Clonality - primary
Count of 10km squares in Great Britain: 672
Count of 10km squares in Ireland: 72
Count of 10km squares in the Channel Isles: 3
Atlas Change Index: -0.27
Weighted Changed Factor: 43
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.