This submerged aquatic perennial occurs in both standing and flowing waters, including rapidly flowing, peaty streams and rivers in which few other macrophytes grow. In Scotland and Ireland it occurs in a wide range of habitats (including, occasionally, highly calcareous sites) but in S.E. England it is confined to acidic, mesotrophic or oligotrophic waters. 0-780 m (Lochan an Tairbh-uisge, Mid Perth).
The map of this species is much more complete than that in the 1962 Atlas, with many more 10-km square records in Wales, Scotland and Ireland. The losses in lowland England largely occurred before 1930.
Suboceanic Boreo-temperate element; also in N. America.
Perennation - primary
Life Form - primary
Clonality - primary
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.