Plants 60-180 cm tall, very scarcely hairy. Stem 3-8(-10) mm in diam., erect, hollow, glabrous. Leaves 20-35 cm; stipules leaflike, widely ovate, (20-)30-70 mm, behind stem connate up to top, free from petiole, glabrous or ciliate; petiole 3-5.5 cm, like rachis glabrous or sparsely white hairy; leaflets in (8-)11-20 pairs, narrowly ovate to narrowly oblong, (15-)20-55 × (4-)7-18 mm, abaxially loosely to rather densely covered with appressed to ascending white hairs, later glabrescent, adaxially glabrous, margins distinctly ciliate, apex obtuse to widely retuse. Racemes 6-25 cm, rather densely many flowered (up to more than 100); peduncle 4-10 cm, glabrous; bracts caducous, whitish membranous, 4-14 mm, hairy. Calyx 8-13 mm, glabrous or loosely to rather densely hairy; teeth unequal, 3-8 mm. Petals whitish yellow to yellow, sometimes fading violet; standard widely oblong to obovate, 12-15 × 6-8 mm, apex emarginate; wings 12.5-15 mm; keel 12-14 mm. Stigma glabrous or sparsely hairy. Legumes with a stipe 1-2 mm, narrowly ellipsoid to narrowly oblong, 18-32 mm, 4-6 mm high and wide, long acuminate, 2-locular; valves thin, yellowish to pale brown, glabrous.
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