Centaurea (/ˌsɛntɔːˈriːə/)[1] is a genus of over 700 species of herbaceous thistle-like flowering plants in the family Asteraceae. Members of the genus are found only north of the equator, mostly in the Eastern Hemisphere; the Middle East and surrounding regions are particularly species-rich.
Common names for this genus are centaury, centory, starthistles, knapweeds, centaureas and the more ambiguous bluets; a vernacular name used for these plants in parts of England is loggerheads (common knapweed). The Plectocephalus group – possibly a distinct genus – is known as basketflowers. Cornflower is used for a few species, but that term more often specifically means either C. cyanus (the annual cornflower) or Centaurea montana (the perennial cornflower). The common name centaury is sometimes used, although this also refers to the unrelated plant genus Centaurium.[2]
The name is said to be in reference to Chiron, the centaur of Greek mythology who discovered medicinal uses of a plant eventually called "centaury".
