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Canada thistle
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a prickly European weed (Cirsium arvense) of the composite family, with heads of purplish flowers and wavy leaves: now common as a fast-spreading, injurious weed throughout the N U.S.
See Canada thistle in American Heritage Dictionary 4
noun
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.
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