Inflorescence surrounded by a conspicuous involucre of sterile bracts .

不被一不育的苞片的明显的总苞包围的花序。

Any of various thistles of the genus centaurea , 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。

Inflorescence surrounded by a campanulate involucre .

一钟状的总苞包围花序。

Bristles of involucre unbranched or branched only at extreme base .

只在极端基部的总苞的刚毛不分枝的或分枝。

Leaves both basal and cauline ; inflorescence without an involucre .

叶都为基生和茎生；没有一总苞的花序。