Centaurea aristata subsp. langeana, (Willk.) 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 : 276

(b) Subsp. langeana (Willk.) Dostál , loc. cit. (1976)

( C. langeana Willk. ):

Involucre 5-10 mm in diameter, narrowed at base; entire part of appendages triangular, longer than wide, the apex 0-8 mm, acuminate, not spiny. Pappus about as long as achene. N. W. Spain.