Viola bertolonii, Pio

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1981, Flora Europaea. Volume 2. Rosaceae to Umbelliferae, Cambridge University Press : 277

49. V. bertolonii Pio , De Viola 34 (1813)

( V. heterophylla Bertol. , non Poiret).

Glabrous, rarely puberulent or hairy perennial with stems up to 30 cm. Leaves variable in shape and size, but the lower always different in shape from the upper; the lower usually orbicular or ovate, obtuse, crenate, more or less long-petiolate, with stipules much shorter than the petiole and not or only slightly divided; the upper usually narrow, linear, entire, with pinnately or palmately divided stipules which have 3-5 narrow segments, of which the terminal is the longest. Flowers large, violet or yellow, more or less square in face-view; the petals usually contiguous, the lower petal the widest. Spur long, about equalling the petals, acute, straight or slightly curved. Maritime Alps, N. Appennini ; S. Italy, N.E. Sicilia. G a It Si.