[Thistles: The Genus Cirsium West of the Cascade Mountains of Oregon and Washington]

Canada Thistle, Creeping Thistle

Cirsium arvense

Synonyms: Cirsium arvense var. arvense, Cirsium arvense var. horridum

Canada Thistle, Creeping Thistle: Cirsium arvense (Synonyms: Cirsium arvense var. arvense, Cirsium arvense var. horridum)


Paul Slichter