I find A.petraea on ledges or growing out of cracks on mountains and because it is on of many similar white crucifers, you need to get close for a positive identification which isn't always easy . The flowers are not entirely dissimilar to A caucasica (Garden Arabis) which grows abundantly on the limestone rocks of the White Peak in Derbyshire, but the leaves are quite different. This plant was very conveniently only 4 feet off the ground growing out of a crack on cliffs below Snowdon summit.
Cliffs near Snowdon, North Wales, 2nd June 2004
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Added on 1st November 2004
Amended on 16th November 2004