Description from Flora of China
Phaseolus aconitifolius Jacquin, Observ. Bot. 3: 2. 1768.
Annual herbs, trailing. Stems slender, 60-130 cm, angular, sparsely pubescent. Stipules peltate, lanceolate, ca. 1.2 cm; petiole 5-10 cm; leaflets deeply 3-5-lobed, 5-8 cm, lobes linear-lanceolate, ± hairy, margin entire. Racemes axillary, headlike; peduncles 5-10 cm; bracts lanceolate, ciliate; pedicels short. Flowers clustered 2-5 together. Calyx 2-3 mm; lobes 5, subequal. Corolla yellow, 5-6(-9) mm; standard cordate; wings obovate, auriculate; keel apex contorted. Legumes brown, cylindric, 2.5-5 cm × 4-5 mm, hispidulous, with obtuse beak, 4-9-seeded. Seeds yellow, brown, or variegated with black dots, elliptic, 4-5 mm; hilum white, linear.
In grass; ca. 1000 m. Yunnan [India, Myanmar, Pakistan, Sri Lanka; cultivated elsewhere].