Trifolium patens, Schreber

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 : 166

41. T. patens Schreber in Sturm, Deutschl. Fl. Abt. 1, Band 4, Heft 16 (1804).

Annual, sparsely hairy; stems 20-50 cm, flexuous, erect or ascending. Leaflets up to 18 mm, narrowly ellipticobovate, the terminal subsessile or with a petiolule up to 2 mm. Stipules ovate, dilated and rounded at the base. Heads 10-15 mm in fruit; peduncles 20-50 mm, slender, usually much longer than the leaves. Flowers almost sessile. Upper calyx-teeth shorter than the upper limb of the calyx-tube; lower calyx-teeth equal to or longer than the lower limbof the calyx-tube. Corolla 5-7 mm, yellow; limb of standard oblong-ovate, sulcate. Moist grassland. C. & S. Europe. Al Au Bu Co Cr Cz Ga Gr He Hs Hu It Ju Po Rm Tu.