Lathyrus montanus, Bernh. Lathyrus pratensis, L.

19. L. montanus Bernh. View in CoL , Syst. Verz. Erfurt 247 (1800)

(£. macrorrhizus Wimmer). Glabrous or subglabrous perennial; stem 15-50 cm, winged. Leaves without tendril; leaflets (1—)2—4 pairs, 10-50(-100) x 1—12(—16) mm, linear to elliptical; stipules 5-25 x 2-8 mm, linear or lanceolate, semi-sagittate. Racemes 2- to 6- flowered. Calyx-teeth unequal; corolla 10-16 mm, crimson, becoming bluish. Legume 25-45 x 4-5 mm, red-brown, glabrous. Seeds 4-10, smooth; hilum j —| of the circumference. 2n = 14. S., W. & C. Europe, extending to the Baltic region and White Russia. Al Au Be Br Co Cz Da Fe Ga Ge Hb He Ho Hs Hu It Ju Lu No Po Rs (B, C) Su.

20-22. L. pratensis group. Glabrous or pubescent perennial; stem not winged. Leaflets usually 1 pair; stipules sagittate. Racemes 2- to 12-flowered. Calyx-teeth unequal; corolla 10- 20 mm, yellow. Legume 20-40 x 4-7 mm, black, glabrous or pubescent. Seeds 5-12, smooth; hilum y -f of the circumference.

1 Leaves mucronate or with a very short simple tendril 21. binatus

1 At least the upper leaves with a distinct tendril

2 Lower calyx-teeth slightly shorter than tube 20. pratensis

2 Lower calyx-teeth as long as or longer than tube

3 Leaflets 2-9 mm wide, linear-lanceolate to lanceolate; stipules smaller than leaflets 20. pratensis

3Leaflets 8-15 mm wide, ovate; stipules as large as or larger than leaflets 22. hallersteinii

20. L. pratensis L. View in CoL , 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.