A rhizomatous perennial herb, found in sandy or gravelly wet runnels and depressions in saltmarshes, and in brackish ditches and dune-slacks. It also occurs on rocky shores, in freshwater seepages and beside streams where they debouch onto the beach. Lowland.
Most of the losses of B. rufus around the Irish Sea and along the E. coast of Scotland took place before 1930, and the distribution now appears to be generally stable. It may still be present in some of the more remote 10-km squares in which it has not been seen since 1970.
European Boreal-montane element; also in C. Asia and N. America.
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