Shrub or tree, 9–24 m. tall, with pale grey bark, vegetative branches grey or ochraceous, glabrous, with numerous rather prominent lenticels. Leaves compound with two pairs of leaflets and an odd terminal leaflet, glabrous or the petiole and rhachis very shortly and usually slightly or rarely rather densely puberulous; rhachis more or less clearly winged and the petiole often auriculate at the base; leaflets elliptic-oblong to elliptic, rarely oblanceolate to obovate-elliptic, rounded to subacute, and often somewhat attenuated at apex, cuneate and the lateral ones sometimes oblique at the base, lateral 4.5–9.5 cm. long and 1.6–4.3 cm. broad, terminal up to 12 (18) cm. long, margin entire and flat, venation reticulate and subprominent, subcoriaceous. Inflorescences terminal to short branches, cymosely branched, fairly compact, 4–6 cm. long, bracteolate, densely puberulous, many-flowered. Calyx broadly campanulate, 5–6 mm. long, puberulous. Corolla externally glabrous: tube about 1 cm. long. Fruit obovate, 2.2–3.5 cm. long, 1.2–1.4 cm. in diameter, with woody valves. Seeds (including the terminal and scarcely unilateral wing) oblanceolate, 2.5 cm. long, 9 mm. broad. Fig. 1 (p. 3).