Trifolium obscurum subsp. obscurum

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 : 172

(a) Subsp. obscurum :

Upper leaflets obovate, 2 -2 | times as long as wide; free apex of stipules 6-10 mm, lanceolate. Heads not more than 20 mm, globose or ovoid; peduncles longer than the upper stipules. • C. & S. Italy.