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Canada thistle

   Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.32 sec.
Canada thistle
n.
A perennial herb (Cirsium arvense) in the composite family, native to Europe and naturalized as a noxious weed in North America, having spiny-margined leaves and rose-purple or sometimes white flower heads.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.Canada thistleCanada thistle - European thistle naturalized in United States and Canada where it is a pernicious weed
plume thistle, plumed thistle - any of numerous biennial to perennial herbs with handsome purple or yellow or occasionally white flower heads

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They operate at an elevation where Canada thistle usually flourishes due to a soil disturbance, but very little thistle is to be seen," he says.
 
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