18. Lathyrus pratensis Linnaeus, Sp. Pl. 2: 733. 1753.
牧地山黧豆 mu di shan li dou
Herbs perennial, 30-120 cm tall. Stem decumbent or climbing, wingless. Leaves with simple or branched tendril at apex; stipules sagittate, (5-)10-45 × 3-10(-15) mm; leaflets 1-paired, elliptic, lanceolate, or linear-lanceolate, 10-30(-50) × 2-9(-13) mm, puberulent, with parallel veins. Raceme 3-6 × as long as leaf, 5-12-flowered. Calyx campanulate, pubescent; longest tooth longer than tube. Corolla yellow, 12-18 mm; standard orbicular, ca. 14 mm, with claw; wings slightly shorter than standard. Legume black, linear, 2.5-4.5 cm. Seeds yellow or brown, orbicular, smooth. Fl. Jun-Aug, fr. Aug-Oct.
Forests, hill slopes, roadsides. Gansu, Heilongjiang, Hubei, Qinghai, Shaanxi, Sichuan, Xinjiang, Yunnan [Asia, Europe].