Purple Starthistle: Centaurea calcitrapa -
Bachelor's Button, Cornflower, Garden Cornflower: Centaurea cyanus -
Tyrol Knapweed, Meadow Knapweed: Centaurea debeauxii ssp. thuillieri (Synonym: Centaurea xpratensis, Centaurea nigrescens?) -
Diffuse Knapweed, Tumble Knapweed, White Knapweed: Centaurea diffusa -
Iberian Starthistle: Centaurea iberica -
Brown Knapweed: Centaurea jacea -
Bighead Knapweed, Globe Knapweed: Centaurea macrocephala -
Tocalotes, Maltese Starthistle, Maltese Star-thistle: Centaurea melitensis -
Meadow Knapweed, Protean Knapweed: Centaurea xmoncktonii -
Montane Starthistle, Perennial Cornflower, Mountain Bluet, Mountain Cornflower: Centaurea montana -
Black Knapweed, Lesser Knapweed, Hardheads: Centaurea nigra -
Short-fringed Knapweed, Tyrol Knapweed: Centaurea nigrescens (Synonyms: Centaurea debeauxii ssp. thuillieri, Centaurea dubia, Centaurea dubia ssp. nigrescens, Centaurea dubia ssp. vochinensis, Centaurea jacea ssp. nigrescens, Centaurea pratensis, Centaurea transalpina, Centaurea vochinensis) -
Yellow Star Thistle, St. Barnaby's Thistle: Centaurea solstitialis -
Spotted Knapweed: Centaurea stoebe ssp. micranthos (Synonyms: Centaurea biebersteinii, Centaurea maculosa) -