Cirsium boujartii subsp. boujartii

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 : 237

(a) Subsp. boujartii :

Stem 80-150 cm. Leaf-lobes with slender apical spine 4-10 mm. Capitula usually solitary on long branches. Middle involucral bracts with marginal spines longer than the width of the bract, slightly widened distally, with weak apical spine 2-3- 5 mm. Romania.