Centaurea nicaeensis var. riaeana Rchb. f. in Reichenbach, Icon. Fl. Germ. Helv. 15: t. 69. III. 1852
Centaurea nicaeensis var. riaeana in Reichenbach, Icon. Fl. Germ. Helv. 15: t. 69. III. 1852
is basionym for Centaurea riaeana, Fl. Algérie Tunisie: 198. 1905