Carduus taygeteus subsp. insularis

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 : 223

(b) Subsp. insularis Franco , Bot. Jour. Linn. Soc. 71: 48 (1975):

Outer and middle involucral bracts recurved at the top of their proximal |, the appendage 20-30 mm, ending in a spine 4-7 mm; inner bracts shorter than upper middle. N. Aegean region (Limnos and Samothraki).