Plants 50-100 cm tall, with basifixed hairs. Stems at base 3-5(-7) mm thick, glabrous or sometimes in lower part with very short white spreading hairs. Leaves 8-12 cm, with glabrous rachis; stipules green, 10-18 mm, glabrous or ciliate; leaflets in 3 or 4(or 5) pairs, narrowly elliptic to narrowly ovate, 2-6 × 0.5-1.8 cm, glabrous on both surfaces, apex acute to obtuse. Racemes loosely many flowered, 6-16 cm; peduncle 6-20 cm, glabrous; bracts green, 8-12 mm, glabrous or very sparsely ciliate. Calyx shortly tubular, 6-8 mm, glabrous or sparsely appressed hairy; teeth unequal, 2 adaxial distant, triangular acuminate, 0.5-1(-1.5) mm, 3 abaxial close together, narrowly triangular, 1-2(-3) mm. Petals yellow; standard widely rhombic, 17-21 × 11-12 mm, ± rounded at apex; wings 16-18 mm; keel 14-16 mm. Legumes with a slender stipe 6-8 mm, narrowly ellipsoid, 2-3 cm, 7-10 mm high and 3-4 mm wide, acuminate at both ends; valves yellowish, glabrous.
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