Echinops spinosissimus subsp. spinosissimus

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 : 213

(a) Subsp. spinosissimus ;

Leaves glandular-hairy on the veins beneath. Inflorescence 3-5-5-5 cm in diameter, greenish. Involucre 15-25 mm; bracts acuminate or shortly spinose, patent, the middle equalling the outer. Corolla pale blue. Sicilia, Greece.