Campanula stevenii subsp. altaica, (Ledeb.) Fedorov

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 : 80

(b) Subsp. altaica (Ledeb.) Fedorov , loc. cit. (1973)

(C. altaica Ledeb. ):

Calyx-teeth naviculiform, not flat. Corolla pale blue. S.C. Russia and E. Ukraine. Subsp. stevenii occurs in the Caucasus and Anatolia.