Trifolium (Lotoidea), Pers. Flowers

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 : 161

Subgen. Lotoidea Pers. Flowers subtended by free or united bracts (or short glandular hairs). Calyx-throat open, without a ring of hairs or a callosity. Legume included in the calyx or exserted. Seeds (l-)2-4(-10).