Onopordum illyricum subsp. illyricum

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 : 247

(a) Subsp. illyricum :

Stem white- or grey-tomentose; wings up to 10 mm wide, with a spine up to 5 mm. Leaves white- or greyish-tomentose, with indistinctveins beneath. Involucral bracts narrowed into spine up to 3 mm, the lower middle and the outer recurved or patent. Corolla 25-30 mm. From E. Italy westwards.