West Highland Flora

Hairy Rock-cress


Arabis hirsuta

 

Arabis hirsuta

Photo Carl Farmer
5 Jun 2004 Hallaig, Raasay

Occasional on rock ledges and cliffs, prefers limestone

Flower diameter c 3-4 mm.  Pods c 1.5-5 cm long

ID: Typical Crucifer flowers.  Petals not notched, somewhat narrow.  Leaves all undivided (may be distantly and shallowly toothed, or untoothed), those of the basal rosette narrowing to a short stalk, those on the stem unstalked, usually clasping, and held upright.  Pods narrow and straight, not twisted, held erect, appressed to stem.

Other features: In the absence of pods it can be hard to tell from other Crucifers, particularly Twisted Whitlow-grass, which shares many of its characters but has notched petals.  Both species are very hairy and both have numerous stem-leaves which they hold upright, close to the stem.  The very rare Alpine Rock-cress has petals rather more rounded, not so narrow or straight-sided, and considerably larger.  It also has the pods held away from the stem and spreads by stolons which the present species does not.

 

Arabis hirsuta

Photo Carl Farmer
5 Jun 2004 Hallaig, Raasay

  Arabis hirsuta

Photo Carl Farmer
5 Jun 2004 Hallaig, Raasay

 

Arabis hirsuta

Photo Carl Farmer
21 Jun 2004 Druim an Aonaich, Raasay
Height of picture = c 7.3 cm


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