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musk thistle, nodding thistle, Carduus nutans | Eurasian perennial naturalized in eastern North America having very spiny white cottony foliage and nodding musky crimson flower heads; Eurasian perennial naturalized in eastern North America having very spiny white cottony foliage and nodding musky crimson flower heads; valuable source of nectar ❲Carduus nutans❳ |