Liana, high climbing shrub, or small tree. Leaves: petiole and main rachis 12-20 (-26) cm long, pubescent, glabrescent; pinnae 7-17 pairs, pubescent. Leaflets 12-25 pairs per pinna, oblong, 5-12 by 1.5-3 mm, entire, glabrous, nerves and veins invisible. Inflorescences 10-35 cm long, rachis and branchlets pubescent, densely flowered; pedicels 3-8 mm, sparsely puberulous. Hypanthium c. 1 mm high, sparsely puberulous outside. Calyx lobes oblong-ovate, 3.5-4.5 by 1.75-2, almost glabrous except ciliate on the margins. Petals: standard oblong-elliptic, c. 4 by 2 mm, glabrous outside, densely puberulous on the lower half inside and on the margins; the others oblanceolate, 3-4 by 1-1.5 mm, glabrous except puberulous on the lower 1 mm inside and on the margins. Stamens: 7-8 mm; filaments hairy at the lower 2 mm; anthers oblong, c. 1 mm long. Ovary puberulous or only on the convex side, 2-ovuled; style 6-7 mm. Pods not stipitate; seed-bearing part broadly ellipsoid or suborbicular, 1.5-2 by 1-1.5 cm, slightly reticulate, puberulous, glabrescent, or glabrous; wing 5-6 by 1.3-1.8 cm, the basal part gradually narrowed along the margin of the seed-bearing part towards its base. Seeds 6.5 by 5.5 mm.
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