Tree, up to 30 m high, 60 cm diam., with absolutely glabrous branches. Leaves rather coriaceous, elliptic to nearly orbicular, 8-13-nerved, 7-27 by 6-22 cm, with rounded apex and base and slightly undulate margin; in bud folded thus as to leave a faint, longitudinal line between each pair of lateral nerves. Petiole 4½-10 cm long, with 5-10 mm broad wings, with a horseshoe-shaped cushion at the insertion. Wings linear with rounded apex, partly caducous, the part falling off being the whole breadth at the base of the petiole, gradually narrowing to a wholly persistent wing at ⅓-¾ of the petiole; apex auriculate, the auricles of both wings coherent above the petiole, extending slightly above the blade. Flowers solitary, terminal, soon lateral, leaf-opposed. Peduncle 5½-7 cm long, at the base triangular in transverse section. Sepals 5, the outer 2 ca 25-28 by 19-20 mm, the inner 3 35-40 by 20-22 mm, glabrous or not. Petals white, at least 25 by 18 mm. Stamens ca 900, 5-7 mm long, with a 0.7-0.8 mm long acumen. Carpels 7-8, glabrous, ca 9 by 2½ mm with 13 mm long styles, each with ca 8 ovules. Fruit dehiscent. Carpels ca 17 by 10 mm, 1-seeded. Seeds ca 5 by 3½ mm, enclosed by a 3 mm long aril.
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