Plants 30-70(-120) cm tall, sparsely hairy. Stems several, up to 7 mm thick, glabrous. Leaves 6-15 cm; stipules 15-30 mm, sparsely ciliate; petiole 1-5 cm, like rachis glabrous or very sparsely hairy; leaflets in 3-7 pairs, narrowly elliptic to obovate, 1-6 × 0.4-2.5 cm, glabrous on both surfaces or sometimes abaxially loosely covered with nearly spreading white hairs 0.5-1 mm, apex obtuse. Racemes rather densely 8-to many flowered, later strongly elongating; peduncle 6-25 cm, glabrous or sparsely white hairy, toward raceme also black hairy; bracts whitish or greenish, linear, 5-10 mm, black ciliate, soon falling. Calyx turbinate-tubular, 6-9 mm, glabrous or sparsely hairy outside, on inner side in upper 1/2 of tube densely appressed black hairy, rarely also in upper 1/2 of outer side rather densely black hairy; teeth triangular, 1.5-2(-3) mm. Petals yellow, all of equal length; standard oblong to slightly obovate, 18-24 × 6-8 mm, somewhat constricted in middle. Legumes with a stipe 8-10 mm, narrowly ovoid, 2-2.5 cm × 5-6 mm, keeled ventrally, flattened dorsally, apex long acuminate; valves papery, very densely black hairy.
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