An annual of sandy, gravelly and rocky places, commonly on thin acidic soils around rock outcrops, on walls, cliff-tops, heaths and sand dunes. It is rarely recorded as a wool casual. Generally lowland, but reaching 685 m on Mangerton Mountain (S. Kerry).
A. praecox was mapped as `all records` in the 1962 Atlas. It seems to have declined in C. Ireland and England, but not to the extent of A. caryophyllea.
Suboceanic Southern-temperate element; widely naturalised outside its native range.
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Light (Ellenberg): 8
Moisture (Ellenberg): 2
Reaction (Ellenberg): 4
Nitrogen (Ellenberg): 2
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.5
July Mean Temperature (Celsius): 14.3
Annual Precipitation (mm): 1149
Height (cm): 10
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 2450
Count of 10km squares in Ireland: 659
Count of 10km squares in the Channel Isles: 13
Atlas Change Index: -0.19
Weighted Changed Factor: -14
Weighted Change Factor Confidence (90%)
Atlas text references
1988. Comparative Plant Ecology.
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.
1990. The BSBI Monitoring Scheme, 1987-1988. 2 vols. Nature Conservancy Council Report no. 1265.