Carduus affinis subsp. affinis

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 : 229

(a) Subsp. affinis :

Stem arachnoid-hairy. Leaves white-tomentose beneath. Involucral bracts with apical spine 0- 3-0-5 mm; inner bracts veinless. Throughout the range of the species.