Cirsium carniolicum subsp. carniolicum

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 : 239

(a) Subsp. carniolicum :

Capitula with 2-5(-8) subtending leaves about as long as capitulum. Involucre 16-20 x (15-) 18- 28(-30) mm; outer bracts shorter than middle and inner, with short, erecto-patent apex; inner with fimbriate-ciliate, scarious apex. 2л = 16. E. Alps.