Blessed Thistle: Centaurea benedicta (Synonym: Cnicus benedictus)
Bachelor's Button, Cornflower, Garden Cornflower: Centaurea cyanus -
Diffuse Knapweed, Tumble Knapweed, White Knapweed: Centaurea diffusa (Synonym: Acosta diffusa) -
Hybrid Knapweed, Meadow Knapweed, Protean Knapweed: Centaurea xgerstlaueri (Synonyms: Centaurea debeauxii ssp. thuillier, Centaurea xmoncktonii, Centaurea nigra x Centaurea jacea, Centaurea xpratensis, Centaurea pratensis) -
Brown Knapweed, Brownray Knapweed: Centaurea jacea (Synnoyms: Centaurea jacea nothossp. pratensis, Centaurea jacea ssp. jacea, Centaurea jacea ssp. nigra) -
Maltese Starthistle, Maltese Star-thistle, Tocalote: Centaurea melitensis -
Montane Starthistle, Mountain Bluet, Mountain Cornflower, Perennial Cornflower: Centaurea montana -
Yellow Star Thistle, St. Barnaby's Thistle: Centaurea solstitialis -
Spotted Knapweed: Centaurea stoebe ssp. micranthos (Synonyms: Centaurea biebersteinii, Centaurea maculosa) -