An annual of damp coastal pastures, poached pond edges and wet hollows, road verges, farm tracks and gateways. It is generally restricted to thin turf or disturbed areas on damp, neutral, moderately fertile soils. Lowland.
R. sardous was first recorded in Britain in 1663. It was last recorded before 1930 from most of the inland sites for which only pre-1970 records are available. It may have been only a casual introduction at some of these localities, perhaps as an impurity of grass seed in sown leys. It persists in submaritime regions of England and Wales, where it is much better recorded than in the 1962 Atlas.
European Temperate element; widely naturalised outside its native range.
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.