Centaurea napulifera subsp. tuberosa, (Vis.) 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 : 300

(b) Subsp. tuberosa (Vis.) Dostál , loc. cit. (1976)

( C. tuberosa Vis. ):

Rhizome short, truncate, without stolons; roots up to 5 cm, fusiform, crowded. Stem 5-20 cm, simple. Leaves grey-tomentose; lower linear-lanceolate, entire, rarely sinuate-dentate; cauline linear, entire. Appendages with decurrent margin c. 1 mm wide. Outer florets dark blue. Mountains of W. Jugoslavia, N. Albania and S. Bulgaria.