Centaurea nigrescens subsp. pinnatifida, (Fiori) 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 : 292

(d) Subsp. pinnatifida (Fiori) Dostál , loc. cit. (1976)

(C. vochinensis forma pinnatifida Fiori ):

Stems with few, long, slender branches. Basal leaves oblong-lanceolate, lyrate, pinnatifid; cauline lanceolate, entire. Involucre 6-7 mm in diameter, ovoid; appendages triangular, brown. Open Castanea-woods. N.C. Appennini (E. of Firenze).