- any of various plants belonging to the genus Centaurium, of the gentian family, having clusters of small pink or red flowers.
- any of several other plants of the genera Centaurea and Sabatia.
- any Eurasian plant of the genus Centaurium, esp C. erythraea, having purplish-pink flowers and formerly believed to have medicinal properties: family Gentianaceae
- any plant of the genus Centaurea, which includes the cornflower and knapweed: family Compositae (composites)
