Tree up to 45 by 0.5 m diam. Bark finely fissured below, smoother above. Buttresses up to c. 1 in high. Leaves coriaceous, shining above, rather dull beneath, ovate, ovate-oblong to ovate-lanceolate, 7.5-11 by 3-5.5 cm; base obtuse to rounded, sometimes acute; apex acuminate; margin cartilaginous, ± entire, sometimes remotely shallow-crenulate; nerves 5-7 pairs, elevated on both surfaces, obliquely spreading and curving upward; veins and veinlets rather densely reticulate, slightly elevated on both surfaces; petiole 0.75-1.75 cm. Panicles up to 14 cm long. Peduncle up to 4⅔ cm. Bracts small, deltoid. Pedicels c. 1 mm. Flowers yellowish, fragrant. Calyx lobes semi-orbicular or reniform, 0.5 by 1.5 mm. Petals ovate, 3 1/3-3⅔ by 2-2½ mm; anthers ovoid, 1.5 by 1 mm, acute, with a very short and obscure connective; filaments c. 1½ mm. Pistil 1.5-2 mm long; ovary broad-ovoid, gradually narrowed into a rather distinct style c. ½ mm; stigma ± broad-oblong, obtuse. Ovules 8-10 in each cell. Fruit valves narrow-oblong, 10-17 by 3-5 cm, leathery, c. 5 mm thick. Seed (including the wing) 7-11 by 2-2 2/3 cm, seed proper 12 by 14 mm.
In primary forests, primary peat-swamp and sometimes freshwater-swamp forests from sea-level to low altitude. Fl. June-Sept., fr. Sept.-Nov.
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Primary forests, primary peat-swamp and sometimes freshwater-swamp forests; at elevations around sea level.
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