详细解释:n. 黑矢车菊
英语解释：
名词 knapweed:
any of various plants of the genus Centaurea having purple thistlelike flowers详细解释：
knap.weed
n.（名词）Any of various thistles of the genusCentaurea, having variously colored flowers grouped in a head with a spiny involucre. 黑矢车菊：一种属于矢车菊属 的蓟属植物，其花有多种颜色，聚集在有刺状花被的头状花序里
来源：Middle English knopwed 中古英语 knopwed knop [knob] from Old English cnop knop [圆块] 源自 古英语 cnop wed [weed] * see weed wed [杂草] *参见 weed