Cirsium
Plant
Cirsium is a genus of perennial and biennial flowering plants in the Asteraceae, one of several genera known commonly as thistles. They are more precisely known as plume thistles. These differ from other thistle genera in having feathered hairs to... Wikipedia
Lower classifications
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2. Heads large (involucre ca. 3.5-6.5 cm broad), mostly solitary on short branches; phyllaries with a strong spine tip ca. 2-6 mm long; upper surface of leaves ...
Canada Thistle - Washington State Noxious Weed Control Board
www.nwcb.wa.gov › weeds › canada-this...
Cirsium arvense. Canada Thistle. Family: Asteraceae. Weed class: C Year Listed: 1988. Native to: Europe and Asia Is this Weed Toxic?: not known to be. Why Is It ...