An annual of dry, barish places on sandy banks, stabilised shingle and around rock outcrops, usually preferring calcareous substrates; also in artificial habitats such as quarries, walls, pavements and railway ballast. 0-355 m (Llangollen, Denbs.).
There has been little change in the distribution of C. rigidum since the 1962 Atlas. Subsp. majus, a coastal plant of S.W. Britain, Ireland and the Channel Islands, was mapped by Perring & Sell (1968), but it is treated as a variety by Stace (1997) and is not mapped separately here.
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.
Atlas text references
Atlas Supp (149a)
1974. Biological Flora of the British Isles. No. 136. Catapodium rigidum (L.) C. E. Hubbard. Journal of Ecology. 62:937-958.
1988. Comparative Plant Ecology.
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.