Centaurea nigrescens subsp. smolinensis

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 : 292

(e) Subsp. smolinensis (Hayek) Dostál , loc. cit. (1976)

( C. smolinensis Hayek ):

Stems simple or with few branches. Leaves entire or dentate; lower ovate-lanceolate; upper narrowly lanceolate. Involucre c. 14 x 7-8 mm, narrowly cylindrical; appendages small, triangular, black. Serpentine rocks. C. Jugoslavia (Bosna).