Centaurea kernerana subsp. kernerana

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 : 295

(a) Subsp. kernerana :

Leaves subglabrous, the uppermost oblong, not subamplexicaul. Florets pale purple. Pappus as long as achene. Stara Planina', Rila Planina.