Lathyrus pratensis, L.

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 : 140

20. L. pratensis L. , Sp. Pl. 733 (1753).

Stem 30-120 cm. Leaves with a tendril; leaflets 1O-3O(-4O) x 2-9 mm, linear-lanceolate to lanceolate or elliptical; stipules (5-)10-30 x 3—6(—12) mm, linear to lanceolate, rarely ovate, smaller than or about as long as the leaflets. Racemes (2-)5- to 12-flowered. Lower calyx-teeth shorter to longer than tube. Corolla 10—16(—18) mm. 2n = 7, 8, 9, 12, 14, 16, 21, 28, 42. Usually in grassland or scrub. Almost throughout Europe. All except?Az BI Cr Sb. Very variable and possibly containing a number of subspecies. There does not seem to be any correlation between morphology and chromosome number.