A fleshy perennial herb of spray-drenched rock crevices and ledges on sea-cliffs, coastal rocks and on stabilised shingle; also in maritime grassland and artificial habitats like harbour walls and stone sea defences. It appears indifferent to soil reaction, being found on many rock types from chalk and limestone to granite. Lowland.
There has been no appreciable change in the distribution of C. maritimum since the 1962 Atlas.
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Light (Ellenberg): 9
Moisture (Ellenberg): 6
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 5
Salt Tolerance (Ellenberg): 5
January Mean Temperature (Celsius): 5.1
July Mean Temperature (Celsius): 15.4
Annual Precipitation (mm): 1042
Height (cm): 45
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 301
Count of 10km squares in Ireland: 138
Count of 10km squares in the Channel Isles: 14
Atlas Change Index: 0.23
Atlas text references
1990. Flora dels Països Catalans, II. Crucíferes-Amarantàcies.
1979. An experimental investigation into the ecology of some maritime cliff species I. Field observations. Journal of Ecology. 67:283-292.
1980. Umbellifers of the British Isles. Botanical Society of the British Isles Handbook no. 2.