Trees, 4-15 m tall. Young shoots, petioles, and inflorescence ferruginous hairy; old branches with yellowish, small lenticels. Leaves 30-42 cm; petiole robust; rachis 25-35 cm; pinnae 7-15 pairs, opposite, 8-12 cm; leaflets (7)10-21 pairs, crowded together, oblong-obovate, 1.2-1.7 cm × 5-7 mm, leath­ery, abaxially pale green, adaxially deep green, base oblique, margin entire, apex rounded, mucronate.

Panicles terminal or axillary, densely ferruginous puberulent; bracts caducous, 5-8 mm. Pedicels ca. 5 mm, ca. as long as flower buds, 5-7 mm from one another. Flower buds globose, 5-8 mm in diam. Se­pals ovate, 5-8 × 4-7 mm, outside ferruginous tomentose. Petals obovate, 1.5-1.7 cm × 8-10 mm, densely ferruginous pubescent at the middle of both surfaces, long-clawed. Filaments ca. 1.2 cm, hirsute at the base; anthers ca. 3 mm, sagittate at the base. Ovary stalked, hairy, 3- or 4-ovuled; style filiform, much longer than ovary, smooth; stigma discoid, 3-lobed. Legume winged, compressed, fusiform, narrowed to both ends, longitudinally veined at middle part; wings 4-5 mm wide. Seeds 2-4. 2n = 26.