西南野豌豆 xi nan ye wan dou

Herbs perennial, 15-50(-100) cm tall, pilose. Stem much branched. Leaves paripinnate, 3.5-8 cm; stipules semihastate, margin 2-4-toothed; leaflets 2-7-paired, elliptic, 4-13(-20) × 2-6 mm, abaxially densely hairy, adaxially sparsely papilli­ferous, apex obtuse or truncate, mucronate; lateral veins 7-12-paired, not obvious; tendril branched, slender. Raceme 2-4 cm, shorter than or subequaling leaf, 6-9(-12)-flowered. Ca­lyx campanulate. Corolla yellow; standard ca. 9 mm, sub­equaling wings and keel, apex retuse. Ovary shortly stalked, linear, glabrous; ovules 2-6. Legume oblong-rhomboid, 20-25 × 4-7 mm, both ends acute. Seeds 2-4. Fl. Jun-Sep, fr. Jul-Oct.

● Forests, Pinus-forested steppes on schistose clay, thickets, grass­land slopes, sandy riverbanks; 1400-3700 m. Gansu, N and SW Si­chuan, Xizang, NW Yunnan.