A submerged or emergent rhizomatous perennial which grows in calcareous, often eutrophic, water at the edges of rivers, lakes, canals, ditches and in swamps. It rarely sets seed but reproduces by lateral buds on the rhizome. Lowland.
B. umbellatus has maintained its core distribution since the 1962 Atlas. It has spread in the Tweed catchment, where it was first recorded in 1956, and along the River Eden (Cumbria). In Ireland Webb & Scannell (1983) suggest that it is native in some areas, including Co. Clare, but it is treated here as alien; it spread rapidly around Lough Neagh in the 20th century.
Eurosiberian Temperate element; widely naturalised outside its native range.
Height (cm): 150
Perennation - primary
Life Form - primary
Clonality - primary
Clonality - secondary
Comment on Clonality
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.