Centaurea atropurpurea subsp. soskae, (Stoj. & Acht.) Dostal

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1976, Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae), Cambridge University Press : 266

(b) Subsp. soskae (Stoj. & Acht.) Dostál , Bot. Jour. Linn. Soc. 71: 195 (f 916) ( C. atropurpurea var. soskae Stoj. & Acht. ): Leaves arachnoid-lanate, lyrate; segments oblong. Involucral bracts with appendages 5-8 mm. S. Jugoslavia (Makedonija).

C. globurensis E. I. Nyárády , Bul. Grad. Bot. Univ. Cluj 14: 218 (1934), from S.W. Romania (Banat), is like 31 but has simple stems, subglabrous leaves, involucre c. 16 mm in diameter and brown fimbriae on the triangular, mucronate appendages; its status is uncertain and further study is required.