Tree up to 25(-40) m tall, often much smaller in cultivation, branchlets glabrous. Leaves short petioled, petiole 10-20 mm; petiolules twisted, very short, 2-4 mm. Leaflets coriaceous, falcate to broadly falcate, rarely oblong or obovate, 4-10 by 2-5 cm, glabrous; apex shortly acuminate, obtuse, rarely retuse; base asymmetric. Inflorescences shortly, densely corymbose-paniculate; pedicels c. 6 mm. Hypanthium c. 6 mm long. Calyx lobes 4, coriaceous, ovate to elliptic, 15-18 by 8 mm, pubescent outside, sericeous inside. Petals yellow, streaked with red, subsessile, oblong, ovate or obovate, more or less equalling the calyx lobes or slightly longer. Stamens 3-3.5 cm. Ovary stipitate (stipe 4-8 mm), c. 4 by 2 mm, glabrous, 12-15-(or more-)ovuled. Pods oblong or cylindric, compressed, 8-14(-20) by 4-6(-8) cm, smooth or rough, dark brown, 6-12-(or more-)seeded. Seeds oblong, obovoid, or ellipsoid, 2-3 cm long.
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