Viola ambigua, Waldst. & Kit.

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 : 273

8. V. ambigua Waldst. & Kit. , Pl. Rar. Hung. 2: 208 (1804).

Perennial with leaf-rosette; rhizome stout, more than 2 mm thick. Leaves oblong-ovate with truncate base, usually sparsely hairy, later glabrescent. Stipules 1-1-5 cm, dark green, broadly lanceolate, shortly glandular-fimbriate, ciliate. Peduncles scarcely exceeding the leaves; bracts at or below middle. Flowers 1-1-5 cm, fragrant. Sepals c. 3 - 5 mm, oblong. Petals dark violet. Spur 2-4 mm, curved, stout. Capsule pubescent. 2zi = 40. Calcifuge. From E.C. Russia westwards to Macedonia and E. Austria. Au Bu Cz?Ge Hu Ju Rm Rs (C, W, K, E).