Trifolium incarnatimi subsp. incarnatum

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 : 168

(a) Subsp. incarnatum :

Stems robust, erect, often unbranched, not very hairy. Heads dense. Corolla blood-red, rarely pure white, equalling or slightly exceeding the calyx. Cultivated and widely naturalized.