Centaurea pratensis subsp. nigrescens (Willd.) P. Fourn., Quatre Fl. France: 1017. 1940
Centaurea pratensis subsp. nigrescens, Quatre Fl. France: 1017. 1940
is new combination for Centaurea nigrescens, Sp. Pl. 3: 2288. 1803
Centaurea pratensis subsp. nigrescens, Quatre Fl. France: 1017. 1940