Came across this thistle like plant in Anglesey a couple of weeks ago.
At first I thought it was a thistle with insects or something, but close
inspection showed that the white spots were actually raised bumps and
quite regular across all the leaves, even the emerging ones. 2 plants
side by side along the coast path, no others visible.

Pictures at:

http://www.photobox.co.uk/album/5371675767

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