Shrub or suffrutescent herb to 3 m tall, stem striate, strigulose. Leaves tri-foliolate, the terminal leaflets narrowly elliptic to elliptic, apex acute, acuminate or mucronulate, the base cuneate, 4.5-7.1 cm long, 1.4-2.7 cm broad, the margins entire, above glabrous, beneath strigulose, the veins 7-16 on each side of the midvein, lateral leaflets similar, but slightly smaller; petiole 2.5-5.0 cm long; stipules linear triangular, ca. 4.0 mm long, frequently absent. Inflorescences ter-minal racemes, bearing 15-30 flowers; bracts linear, 7-10 mm long, caducous; pedicels 5-9 mm long; bracteoles linear, 6-10 mm long, strigulose, located just above mid-pedicel, caducous. Flowers yellow 12-18 mm long, calyx 10-13 mm long, the tube campanulate, the lobes 1.5-2.0 times as long as the tube, strigulose; corolla yellow, with purple veins, 14-18 mm long, the standard 13-14 mm long, 18-21 mm broad, retuse, the wings 12-15 mm long, the claws 3.0-3.8 mm long, oblong, oblique, the keel 13-15 mm long, the non-twisted beak short, stamens dimorphic, the long anthers 2.8-3.1 mm long, the short anthers 0.5-0.7 mm long; style with a pubescent stigma, curved geniculate, 8.5-9.0 mm long. Legume inflated, 3.2-3.5 cm long, strigulose, brown at maturity; seeds ca. 20, tan to brown, oblique cordiform, to 3.5 mm long.
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Herbs or shrublets, to 2 m tall. Stems terete, thick, densely rusty appressed pubescent. Stipules acicular, very minute, persistent or caducous. Leaves 3-foliolate; petiole 2-5 cm; petiolules ca. 2 mm; leaflet blades elliptic to narrowly elliptic, 4-7(-10) × 2-3 cm, terminal one larger than lateral ones, thin, veins distinct on both surfaces, midvein abaxially sparsely pilose and adaxially pilose, secondary veins 8-15 on each side of midvein, base cuneate, apex acuminate and mucronate. Racemes terminal, 10-30 cm, 20-30-flowered; bracts linear, 0.7-1.3 cm, caducous. Pedicel 5-7 mm; bracteoles similar to bracts but smaller. Calyx subcampanulate, 7-10 mm, 5-lobed, densely rusty silky pilose; lobes broadly lanceolate, ± as long as tube. Corolla yellow, exserted beyond calyx; standard orbicular, ca. 1.4 cm in diam., base with 2 appendages, apex obtuse to retuse; wings oblong, ca. 1.3 cm; keel ca. 1 cm, abruptly rounded slightly below middle, beak slightly incurved. Legume oblong, 2.5-4 × 1-1.5 cm, 20-30-seeded, densely pilose when young, glabrescent; stipe 2-4 mm. Seeds black when mature, obliquely cordate, nearly smooth. Fl. May-Sep, fr. Aug-Dec.
A herb or small shrub. It grows 2 m tall. The stems have rusty hairs. The leaves have 3 leaflets. These are 4-7 cm long by 2-3 cm wide. The end one is largest. The flowers are in groups or 20-30 at the ends of branches. They are yellow. The pods are oblong and 3-4 cm long by 1-2 cm wide. There are 20-30 seeds.
Savannahs, steep banks, hillsides, barrancas, frequently in grassland in openings of oak forest and occassionally in oak-pine forest; at elevations from 800-1,700 metres.
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It is a tropical plant. In China it grows in grassland between 100-2,400 m above sea level. In Yunnan.
Can be grown by cuttings or seedlings. Seeds needs soaking.
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