Centaurea

from WordNet (r) 3.0 (2006)

Centaurea
    n 1: knapweed; star thistle [syn: {Centaurea}, {genus
         Centaurea}]

from The Collaborative International Dictionary of English v.0.48

Centaurea \Cen`tau*re"a\, prop. n. [NL. See {Centaury}.] (Bot.)
   A large genus of composite plants, related to the thistles
   and including the cornflower or bluebottle ({Centaurea
   Cyanus}) and the star thistle ({Centaurea Calcitrapa}).
   [1913 Webster]