Shrub or small tree to 3 m tall; young stems glabrescent to glabrous. Leaves 70-360 mm long, glabrescent to glabrous; petiole 11-48 mm long; petiolule 2-6 mm long, glabrescent to glabrous; stipules triangular, 1-2 mm long, glabrescent to glabrous, persistent; leaflets 8-26, oblong-obovate to obovate, 14-38 x 5-16 mm, base acute and sometimes attenuate towards petiolule, apex blunt to rounded and sometimes slightly retuse, mucronulate to blunt. Inflorescence flexible, racemose, 80-210 mm long; glabrescent to glabrous, 15-40-flowered; bracts triangular, 0.5-1.0 mm long, glabrescent to glabrous; bracteoles minute to absent. Hypanthium 2-3 mm long. Calyx base intrusive; lobes 0.5-2.5 mm long, triangular, straight, shorter than tube. Petals: standard suborbicular to broadly elliptic, sometimes slightly obovate, 4-6 x 5-7 mm, erect, apex reflexed, claw 3-6 mm long, glabrous; wing falcate-elliptic to falcate-ovate, 4-9 x 2.5-5.0 mm, upper basal region lightly pocketed, or sculptured, claw 3-6 mm long; keel 3.0-7.5 x 2.5-5.0 mm, apex acute to obtuse, claw 3-5 mm long. Stamens fused basally to half their lengths, glabrous. Ovary 3-8 mm long, glabrous or upper margin sparsely puberulous; stipe 2.5-7.5 mm long; ovules 6 or 7; style 2-3 mm long. Fruits 29-45 x 10-12 mm, 1-3-seed-ed, ligneous, glabrous, deep brown, venation prominent; upper suture wing 0.5-2.0 mm broad. Seeds 5.0-7.0 x 3.5-5.0 mm. Flowering time: October to April.
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