This rhizomatous perennial grows in reed-swamps and other vegetation at the edges of lakes, pools and slow-flowing streams and rivers, and in flushes and wet hollows in fens; it can also colonise old peat workings and drainage channels. It generally occurs in nutrient-poor water, which may be base-rich or base-poor. 0-650 m (E. of Beinn Heasgarnich, Mid Perth).
Some C. lasiocarpa localities were lost to drainage before 1930, and since the 1962 Atlas there have been further declines in East Anglia, and in other areas of lowland England and E. Ireland. Conversely, more intensive fieldwork has revealed many new 10-km squares elsewhere.
Circumpolar Boreal-montane element.
Count of 10km squares in Great Britain: 461
Count of 10km squares in Ireland: 169
Count of 10km squares in the Channel Isles: 0
Atlas Change Index: 0.73
PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections. A hardcopy can be purchased from the Centre for Ecology and Hydrology.
Atlas text references
Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols,
, Königstein, (1986)
Sedges of the British Isles. Botanical Society of the British Isles Handbook no. 1, edn 2,
, London, (1982)
Aquatic plants in Britain and Ireland,
, Colchester, (1997)