Centaurea vinyalsii subsp. vinyalsii

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 : 291

(a) Subsp. vinyalsii :

Leaves lanate-pubescent, glabrescent; lower cauline lingulate-lanceolate, sinuatelypinnatifid atthe base; upper narrowly linear, entire. Capitula subtended by the uppermost leaves. Involucre 12—14(—16) mm in diameter. N.E. Spain.