carduus : Idioms & Phrases
carduus crispus
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noun European biennial introduced in North America having flower heads in crowded clusters at ends of branches
welted thistle.
WordNet
carduus nutans
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noun Eurasian perennial naturalized in eastern North America having very spiny white cottony foliage and nodding musky crimson flower heads; valuable source of nectar
nodding thistle; musk thistle.
WordNet
genus carduus
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noun genus of annual or perennial Old World prickly thistles
Carduus.