Astragalus frigidus subsp. frigidus

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 : 114

(a) Subsp. frigidus :

Stems 10-35 cm; leaflets 4-8 pairs, sparsely hairy or glabrous beneath; calyx often reddish, sparsely white- hairy on tube, densely black-hairy on teeth. 2« = 16. Throughout the range of the species.