Description from Flora of China
Subshrubs, 20-100 cm high. Stem yellow-brown, glabrous, much branched from base. Leaves many and dense, 10-15 cm; stipules absent; leaflets 11-17, opposite, variable in shape, elliptic, orbicular, ovate, or obovate-oblong, 10-25 × 7-15 mm, nearly leathery, hairy when young, becoming glabrous, usually glandular-punctate, base rounded, apex obtuse or mucronate. Racemes terminal, ca. 12 cm. Flowers widely spaced; bracts subulate, less than 1 mm, persistent; pedicel ca. 5 mm. Calyx obliquely campanulate, pilose; teeth 5, unequal. Corolla purple; standard obovate, 5-7 × 3-4 mm, apex retuse, narrowing to claw; wings linear-oblong, 2-auriculate, claw ca. 1.5 mm; keel falcate, incurved. Stamens 10, slightly fused at base. Ovary pilose, shortly stalked; ovules 6; style glabrous. Legumes moniliform, glabrescent, apex beaked. Seeds 2 or 3, dark brown, elliptic, ca. 6 mm, lustrous. Fl. Jul-Aug.
● Dry wastelands. Hainan.