Trifolium

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

Sect. Lotoidea . Annual or perennial. Flowers umbellate, rarely spicate, numerous, pedicellate, subtended by lanceolate membranous bracts. Calyx-teeth unequal. Legume (1—)2- to 4(-5)-seeded.