Medicago sativa subsp. sativa

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 : 154

(a) Subsp. sativa; Corolla 7-11 mm, blue to violet; legume 4-6 mm in diameter, in a spiral of 1 |-3 | turns. 2n = 32. Cultivated as forage and naturalized throughout the range of the species. Origin uncertain.