Trifolium congestum, Guss.

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 : 169

70. T. congestum Guss. , Cat. Pl. Boccad. 81 (1821).

Annual; stems 1-3 cm, numerous, stout, woody, procumbent, glabrous. Leaflets 5-9 mm, narrowly cuneate, deeply emarginate, obscurely denticulate, densely appressed-pubescent above and beneath; petioles up to 30 mm; stipules membranous, broadly ovate, abruptly contracted into a short point. Heads 8-10 mm, pseudoterminal and axillary, sessile, involucrate, more or less congested. Flowers mostly erect. Calyx-tube 20-veined, densely but shortly pubescent; teeth nearly twice as long as the tube, subulate from a narrowly triangular base, glabrous and 5-veined below, with sparse patent hairs above the middle. Corolla 6-7 mm, white, not longer than the calyx. Fields and roadsides on clay soils. Sicilia, S. Italy, Malta. It Si.