Tree 15 m high. Leaves bipinnate, with 1 pair of pinnae, each pinna with 1 or 2 pair(s) of leaflets. Leaflets chartaceous, elliptic oblong, 8-15 by 3-6 cm, glabrous, acuminate at the apex; petiolules 0.2-1 cm. Inflorescences terminal, paniculate, moderately branched, up to 40 cm long, densely flowered, rachis densely short-pilose; lateral branchlets spiciform, 10-15 cm long; pedicels c. 1 mm, articulated at the base. Calyx 2 mm long, loosely puberulous at the base, the lobes crescent, 0.5 mm long, 1 mm wide, ciliate. Petals broadly elliptic, 2.5-3 by 1.5-1.75 mm, concave. Anthers narrow-oblong, 1.2 mm, slightly hairy at the apex and base. Ovary sessile, narrowly ellipsoid, 1.5 mm long, glabrous, 5-or 6-ovuled; style oblique, 0.5 mm; stigma slightly widened, minutely bilobed. Pods more or less straight, 2-or 3-seeded, 18 by 4 cm, contracted between the roundish bulging parts; pericarp hard and woody almost 3 mm thick, dehiscent at least along one suture.
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