Plants 60-90(-120) cm tall, very sparsely hairy. Stem 4-6.5 mm thick, erect, hollow, mostly branched, glabrous. Leaves 10-25 cm; stipules 1-4.5 cm, glabrous, 2 stipules of 1 leaf often distinctly different in form and length; petiole short, like rachis glabrous; leaflets in 4-8 pairs, ovate to obovate, 10-30 × 9-16 mm, glabrous or abaxially with a few appressed white hairs, apex obtuse to slightly retuse. Racemes at anthesis 5-10 cm, rather densely 20-50-flowered, later elongating to 15-30 cm; peduncle 5-8 cm, elongating up to 16 cm with age, glabrous; bracts narrowly triangular, soon falling, 2.5-7 mm, glabrous or ciliate. Bracteoles mostly absent, if present minute, ca. 0.5 mm. Calyx 8-10.5 mm, glabrous; teeth mostly unequal, 1-5 mm. Petals pale yellow; standard oblong or obovate, 15-19 × 5.5-8 mm, apex retuse to emarginate; wings 15-18 mm; keel 14-15.5 mm. Stigma glabrous or with a few short hairs. Legumes with a stipe 6-10 mm, narrowly ellipsoid, 2-5 cm, 4-8 mm high, compressed laterally, keeled ventrally, grooved dorsally, with a short beak, 2-locular; valves thin, glabrous.
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