Centaurea aspera subsp. scorpiurifolia

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 : 284

(c) Subsp. scorpiurifolia (Dufour) Nyman , loc. cit. (1879)

( C. scorpiurifolia Dufour ):

Stems c. 20 cm, simple or sparingly branched. Leaves undivided, entire to serrate; lower oblongovate, acuminate. Involucre 10-15 mm in diameter, ovoid; appendages with 3-5 divergent spines. S. Spain.