is a specific kind of: flower.

is a broader term that covers: Centaurium calycosum, rosita | Centaurium minus, lesser centaury | Centaurium scilloides, tufted centaury | seaside centaury | broad leaved centaury | slender centaury.

is a member of: Centaurium, genus Centaurium.

is a specific kind of: subshrub, suffrutex.

is a broader term that covers: basket flower, Centaurea americana | Centaurea cineraria, Centaurea gymnocarpa, dusty miller | caltrop, Centauria calcitrapa, star-thistle | knapweed.

is a member of: Centaurea, genus Centaurea.