Shrubs, unarmed, 3-8 m tall. Branchlets and petioles pubescent. Stipules deciduous, lanceolate; pinnae 5-8 pairs, 3-6 cm, not glandular; leaflets 10-30 pairs, oblong, 4-8 × 1-3 mm, both surfaces glabrous or abaxially sparsely pubescent, midvein near middle, bilaterally slightly asymmetric, base rounded, margin ciliate, apex obtuse-rounded or very shortly mucronate. Racemes 2-6-fasciculate, axillary, oblong or subglobose, 1-1.5 cm, 20-30-flowered; peduncles 1-1.5 cm. Flowers slightly fragrant; pedicels 1-2 mm. Calyx cup-shaped, ca. 0.5 mm. Corolla 2.5-3 mm, base tubular. Stamens numerous, initially white, turning yellow, 6-7 mm. Legume oblong, compressed, 4.5-6.6 × 1.5-2 cm, membranous, often irregularly constricted, villous. Seeds 3-6. Fl. and fr. Jul-Nov.