Herbs or shrublets, 60-120 cm tall. Stems terete, appressed pubescent. Stipules acicular, 3-4 mm. Leaves 3-foliolate; petiole 3-5 cm; petiolules 1-1.5 mm; leaflet blades narrowly elliptic, 5-7(-9) × 2.5-4 cm, terminal one larger than lateral ones, thin, abaxially sparsely pilose, adaxially glabrous, veins distinct on both surfaces, secondary veins 8-18 on each side of midvein, base attenuate, apex acuminate. Racemes leaf-opposed or rarely terminal, 10-15 cm, 10-30-flowered; bracts acicular, ca. 1 mm. Pedicel 3-7 mm; bracteoles inserted at base of calyx tube, ovate-lanceolate, ca. 3 mm. Calyx subcampanulate, 5-6 mm, 5-lobed, pilose; lobes lanceolate, ± as long as tube. Corolla yellow, exserted from calyx; standard oblong, ca. 9 mm, base with 2 appendages; wings oblong, ca. 8 mm; keel ± as long as wing, curved, beak narrow and slightly incurved. Ovary subsessile. Legume ellipsoid-fusiform, ca. 2 × 0.5-1 cm, 7-or 8-seeded, densely rusty pubescent; style persistent. Fl. Aug-Sep, fr. Oct-Dec.
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