Viola bertolonii subsp. bertolonii

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

(a) Subsp. bertolonii :

Basal leaves usually small, lanceolate to rhombic. Stipules often pinnate. Flowers 2-3 cm in diameter. 2n = 40. Maritime Alps and N. Appennini .

Intermediates occur between this and 48(c).