West Highland Flora

Perennial Sow-thistle


Sonchus arvensis

 

Sonchus arvensis

Photo Carl Farmer
23 Sep 2002 Glenbrittle, Skye

Quite frequent on the shore just above the high tide line.  Is also frequent inland in much of the country, but I don't recall seeing it away from the coast in our area.

Flowerhead diameter c 4-5 cm.  Plants up to 1.5 metres tall.

ID: Distinguished from other sow-thistles by large flower size and patch-forming habit due to spreading by underground rhizomes which put up a succession of shoots.

Other features: Much taller and more robust than other sow-thistles.  Involucres and their stalks often densely covered with yellow hairs (ssp arvensis) but sometimes hairless (ssp uliginosus).

 

  Sonchus arvensis

Photo Carl Farmer
31 Aug 2002 Scorrybreac, Skye

 


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