Centaurea spinosa subsp. spinosa, Fuckel, 1870

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 : 282

(a) Subsp. spinosa ( C. spinosa subsp. tomentosa (Halácsy) Hayek ): Stems and leaves white-tomentose. Florets pale pink. Throughout most of the range of the species.