welted thistle


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Noun1.welted thistle - European biennial introduced in North America having flower heads in crowded clusters at ends of branches
thistle - any of numerous plants of the family Compositae and especially of the genera Carduus and Cirsium and Onopordum having prickly-edged leaves
Carduus, genus Carduus - genus of annual or perennial Old World prickly thistles