An annual of open situations, predominately in artificial habitats but also in gravelly and sandy places. 0-425 m (Grinton, N.W. Yorks.).
The map shows little change from those of the two component subspecies which were mapped in the 1962 Atlas. Comparison of this map with the following maps of the subspecies shows that recorders have only unevenly distinguished between them.
European Southern-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.