Tree to 18 m high and 50 cm Ø. Leaves faintly acuminate to caudate with cuneate base, (narrowly) elliptic, 5-12 by 2-4½ cm; nerves 4-7 pairs, except in var. sumatrana meeting in a looped intramarginal vein; petiole 3-9 mm, not winged. Flowers in a (basally) 3-5-branched very slender panicle of racemes, a raceme, or in var. lingaensis only 1-3 flowers in each inflorescence. Bracts and bracteoles persistent, minute. Pedicels 1-4 mm. Calyx divided into semiorbicular c. l/2 mm long lobes. Corolla 2-3 mm. Stamens 30-50. Disk shortly pilose. Ovary ½-1 mm high; style pilose to glabrous. Fruit ampulliform, c. 1 by 5 mm, with long beak; stone with coarse surface, the inner wall of the stone following the grooved surface of the deeply ruminate cerebrum-like seed; embryo curved with an angle of not yet 90°.
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