Onopordum corymbosum subsp. corymbosum

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 : 246

(a) Subsp. corymbosum :

Leaves pinnatifid; segments lanceolate-triangular or lobulate. Involucral bracts usually contracted and recurved in apical |. E. Spain.