1 species
1 subspecies and varieties
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Onopordum acanthiumcotton thistle, Scotch thistle, Scots thistle
Distribution: Chiefly east of the Cascades in Washington, but also on the west side; introduced throughout nearly all of North America.
Habitat: Noxious weed of dry, open areas and stream banks.
Origin: Introduced from Eurasia
Flowers: June-August