Shrubs to 2 m tall. Branches brown to grayish brown. Leaves pinnate, 10-20-foliolate; petiole and rachis 4-9 cm, caducous; leaflet blades obovate-elliptic to oblong, 1-2 × 0.6-1 cm, pubescent or glabrous, base mostly cuneate, apex obtuse, truncate, or emarginate. Flowers solitary or rarely 2 in a fascicle. Pedicel 1-3 cm, articulate apically. Calyx tube tubular to broadly campanulate, 8-9 mm. Corolla yellow, ca. 2.3 cm; standard suborbicular, claw ca. 1/3 as long as limb; wings with claw ca. 1/2 as long as limb, auricle long and dentiform; keel with claw slightly longer than limb, limb ± cuneate. Ovary nearly glabrous. Legume turgid to cylindric, ca. 5.5 cm, glabrous. Fl. May, fr. Jul-Aug.
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