Description from Flora of China
Herbs or shrublets, 60-120 cm tall. Stems terete, ribbed, densely brownish yellow pubescent. Stipules acicular, ca. 2 mm, caducous. Leaves 3-foliolate; petiole 3-5 cm; petiolules ca. 1.5 mm; leaflet blades elliptic to oblong-elliptic, 3-5 × 2-2.5 cm, terminal one larger than lateral ones, thin, abaxially slightly pubescent to subglabrous, adaxially glabrous, veins distinct on both surfaces, secondary veins 8-10 on each side of midvein, base narrow, apex obtuse to retuse and mucronate. Racemes terminal or axillary, ca. 40 cm, 50-80-flowered; bracts linear, 3-5 mm, caducous. Pedicel 0.8-1.2 cm; bracteoles inserted at base of calyx tube, similar to bracts but shorter. Calyx subcampanulate, 8-10 mm, 5-lobed, brownish yellow appressed pubescent; lobes lanceolate, subequal in length. Corolla yellow, included in calyx; standard obovate, 5-8 mm; wings oblong, 4-6 mm; keel ovate, ± as long as standard, narrowed apically from middle. Legume cylindric, many seeded, densely appressed pubescent; stipe 3-4 mm. Fl. Feb.
● Sandy areas, grassy slopes along rivers; ca. 600 m. Hainan.