nodding thistle

Từ điển WordNet v3.1 - WordNet Dictionary

noun

Eurasian perennial naturalized in eastern North America having very spiny white cottony foliage and nodding musky crimson flower heads;
valuable source of nectar
• Syn:
musk thistle, Carduus nutans
• Hypernyms:
thistle
• Member Holonyms:
Carduus, genus Carduus