Trees, 15-26 m tall. Branchlets grayish yellow, rough, yellowish tomentose, glabrescent. Leaves 7-11(or 13)-foliolate; rachis 15-30 cm, including petiole 2-3 cm; stipels absent; leaflet blades elliptic-obovate, 8-13 × 2.5-3.5 cm, papery, abaxially yellow tomentose, base rounded to subcordate, apex obtuse, acute, or retuse. Pseudoracemes axillary at top of branchlets; rachis nodes with clusters of 2-5 flowers. Pedicel ca. 7 mm. Flowers 0.9-1.1 cm. Calyx 2-2.5 mm; teeth shortly triangular. Corolla lilac; standard broadly orbicular, basally thickened and emarginate. Stamens monadelphous. Ovary villous, with 4 ovules. Legume linear to oblong, 15-27 × 3-3.5 cm, flat, base tapering; stipe ca. 2 cm; both sutures with 2 ca. 1 cm wide woody wings perpendicular to them. Seeds 1 or 2 per legume, black, orbicular, ca. 1 cm in diam. Fl. May-Jun, fr. Sep-Jan.
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