Trifolium fragiferum subsp. fragiferum

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 : 165

(a) Subsp. fragiferum :

Heads 10-22 mm in fruit, globose. Calyx 4-4- 5 mm in flower, with teeth longer than the tube, 8-10 mm in fruit, concealing all or most of the persistent corolla. 2n = 16. Probably throughout the range of the species, but possibly absent from much of S. Europe.