Medium-sized, sometimes large evergreen V-fissured buttressed tree. Panicle, parts of petals exposed in bud, ovary and leaf buds densely persistently pale brown puberulent, twigs, petioles and calyx outside caducously so. Twig c. 2 mm ø apically, terete or +-ribbed; stipule scars short, descending. Leaf buds to 6 by 3 mm, lanceolate; stipules fugaceous. Leaves 9-29 by 5.5-11 cm, ovate to lanceolate, thinly coriaceous; base subequal, obtuse or rarely cordate (subpeltate in young trees); apex broadly to 1 cm long acuminate; nerves 5-8(-9) pairs, slender but prominent beneath, distant, arched, ± applanate above as also the midrib, set at 45°-70°; tertiary nerves densely scalariform, slender, hardly elevated on either surface; petioles 20-33 mm long, slender. Panicles to 22 cm long (if terminal), to 14 cm long (if axillary), singly or doubly branched; branchlets to 4 cm long. Flower buds to 8 by 4 mm, ovoid, lanceolate; sepals ovate, obtuse, the outer 3 somewhat the larger; petals broadly oblong-elliptic, acute; stamens 15, subequal; filaments short, broad, applanate; anther cells linear, subequal, pro-longed into prominent distal horns c. 1/2 their length and as long as the stout appendage; style columnar, c. thrice length of ovary. Fruit shortly pedicellate; 3 longer calyx lobes to 12 by 3 cm, spatulate, obtuse, tapering to c. 8 mm wide at the incrassate saccate base; 2 shorter lobes to 9 by 1.5 cm, otherwise similar; nut to 35 by 15 mm, narrowly ovoid, apiculate.
Common, often semi-gregarious in more or less seasonal Semi-evergreen Dipterocarp forests in the lowlands, uncommon in everwet areas.
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Forests; common in more or less seasonal, evergreen rain forest at elevations up to 700 metres.
Can be grown by seedlings. Seeds needs soaking.