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.
Light (Ellenberg): 8
Moisture (Ellenberg): 3
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 2
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 4.1
July Mean Temperature (Celsius): 15.5
Annual Precipitation (mm): 878
Height (cm): 15
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 1216
Count of 10km squares in Ireland: 494
Count of 10km squares in the Channel Isles: 10
Atlas Change Index: 0.35
Weighted Changed Factor: 27
Weighted Change Factor Confidence (90%)
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.