knapweed
knapweed
noun
noun
- [mass noun]a tough-stemmed Eurasian plant that typically has purple thistle-like flower heads, occurring chiefly in grassland and on roadsides. (also called hardheads)
矢车菊。 （拉丁名C. nigra，亦称 hardheads） - Genus Centaurea, family Compositae: several species, including the widespread common or lesser knapweed (C. nigra) (also called hardheads)
矢车菊属，菊科： 包括分布广泛的普通（或小）矢车菊（拉丁名C. nigra，亦称 hardheads）
- late Middle English (originally as knopweed): from knop (because of its hard rounded involucre or ‘head’) + weed
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