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|Noun||1.||plume thistle - any of numerous biennial to perennial herbs with handsome purple or yellow or occasionally white flower heads|
thistle - any of numerous plants of the family Compositae and especially of the genera Carduus and Cirsium and Onopordum having prickly-edged leaves
Canada thistle, Cirsium arvense, creeping thistle - European thistle naturalized in United States and Canada where it is a pernicious weed