Tree up to 35 m by 90 cm ø, buttresses up to 2 m. Bark smooth, light brown, thin. Stipules lanceolate, 1.75-3 cm. Leaves elliptic-oblong to-lanceolate, rarely ovate-oblong, 6-39 by 2-15 cm; base obtuse or cuneate; apex shortly acuminate or obtuse; nerves 11-20 pairs; petiole 1-10 cm. Panicles crowded at the ends of the twigs, up to 38 cm long; rachis puberulous, glabrescent. Pedicels 2-3 mm. Calyx lobes deltoid, sometimes broadly-oblong, ⅔-1 by ⅔-1 mm, puberulous outside. Petals oblong, broad-ovate, 1.75-2 by 1-1½ mm, obtuse, puberulous inside. Stamens 1.5-2 mm long; anthers triangular, 0.5 by 0.5 mm, obtuse. Disk 5-lobed, lobes broad-oblong, truncate. Ovary ellipsoid, 1.5-2 by 1 mm; styles free, about half as long as the ovary. Fruits 1-1.75(-2) by 0.8-1 1/3 cm, usually 2-lobed, turning yellow, then pink, red or dark red. Seeds 2-4, broad-ellipsoid, subglobose, 9-11 by 6-8 mm, pale brown, usually largely covered by the pink aril.
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A medium sized tree. It grow 35 m tall. The trunk an be 50 cm across. The trunk is fluted at the base. The leaves are arranged in spirals. The flowers can be greenish-yellow or dark purplish-red. The fruit have 2 lobes. They are red. The fruit are 1-2 cm long. There are 2-4 seeds. They are covered with a pink aril or fleshy layer.
Primary and secondary forests on dryland or in peat swamp, or periodically inundated forests, from the lowland up to 450 m, a few specimens collected from 900-1500 m (Perak and Mt Kinabalu). Fl. March-Dec., fr. Jan.-Dec.
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It is a tropical plant. It grows in forests and swamp forests. It grows up to 2,000 m above sea level.
Uses. The dull-brown wood is rather hard and is used for house-building purposes; it is durable under the roof, is not attached by insects, and is not liable to cracking. The black, acid fruits are eaten similarly as Nephelium ( HEYNE Nutt. Pl. 1927 984 BURKILL Dict. 1 1935 1288 ).