West Highland Flora

Alpine Rock-cress


Arabis alpina

 

Arabis alpina

Photo John Birks
Department of Biology, University of Bergen
(Jun 1986 Finse, Norway)

Found among wet rocks in two localities in the Cuillins.  Not known from anywhere else in the British Isles.

Flower diameter c 7-10 mm.  Pod c 20-40 mm on stalk c 8-15 mm.

ID: Flowers as shown, with 4 white unnotched petals.  All leaves undivided but toothed and hairy, the basal leaves narrowing into a short stalk, the stem leaves clasping the stem with a pair of rounded lobes (see picture below right).  Pods narrow and straight, not held close up against the stem like those of Hairy Rock-cress.  Spreads by above-ground creeping stems, which Hairy Rock-cress does not.

Other features: The stem and leaves have star-like hairs, radiating in clusters from a single base point, as do many other Crucifer species.  The sepals are rather bulging and are about half the length of the petals.

 

Arabis alpina

Photo John Birks
Department of Biology, University of Bergen
(Jun 1986 Finse, Norway)

  Arabis alpina

Photo John Birks
Department of Biology, University of Bergen
(Aug 1993 Finse, Norway)

The right-hand picture shows the toothed basal rosette leaves and the similar toothed clasping stem leaves (on the purplish stems).  The smaller oval untoothed leaves in the picture do not belong to this species.

Arabis alpina

Photo John Birks
Department of Biology, University of Bergen
(Aug 1993 Finse, Norway)


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