An annual or biennial herb found in soil pockets on summer-droughted rocks, and on disturbed sandy soil on heaths, commons, waste places, arable fields and, rarely, river or maritime shingle. Generally lowland, but reaching 365 m in Aberdeenshire.
S. annuus was mapped as `all records` in the 1962 Atlas. It has declined significantly throughout its range and analysis of the database shows that most losses have occurred since 1950. Subsp. annuus occurs throughout the range of the species, subsp. polycarpos is mapped separately.
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.