A biennial or perennial herb growing in dry, sunny, exposed situations on rock outcrops and in grassland on base-rich substrates, particularly chalk and limestone; also occurring on sand dunes and on bridges and walls. 0-1005 m (Aonach Beag, Westerness).
A. hirsuta is still widespread in many habitats. Many of the losses were before 1950, probably largely as a result of agricultural improvement, and these have continued, particularly in S.E. England.
Circumpolar Boreo-temperate element.
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Light (Ellenberg): 7
Moisture (Ellenberg): 5
Reaction (Ellenberg): 8
Nitrogen (Ellenberg): 3
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.3
July Mean Temperature (Celsius): 14.6
Annual Precipitation (mm): 1104
Height (cm): 40
Perennation - primary
Perennation - secondary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 1042
Count of 10km squares in Ireland: 143
Count of 10km squares in the Channel Isles: 4
Atlas Change Index: -1.02
Weighted Changed Factor: -50
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.
Jalas & Suominen (1994)
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.
1991. Crucifers of Great Britain and Ireland. Botanical Society of the British Isles Handbook no. 6.