Crupina vulgaris Pers. ex Cass. Crupina vulgaris Pers. ex Cass., Dict. Sci. Nat. (ed. 2) 12: 68. 1818 sec. Barkley & al. 2006=Centaurea crupina L., Sp. Pl. 2: 909. 1753 syn. sec. Barkley & al. 2006