Trees, up to 30 m high, up to 1.5 m girth; flowering branches 2-2.5 mm thick, smooth, hirsute when very young. Stipules obovate, 2-2.5 by 0.6-0.7 mm. Leaves: petiole 8-15 mm long, laterally flattened and deeply keeled on upper side with the walls touching, leaving a closed groove; blade ovate to elliptic, 5.7-14 by 2.5-5.5 cm, length/width ratio 2.1-3, blackish brown when dry, margin revolute, upper and lower surface glabrous, nerves 6-8 per side. Bracts on brachyblasts c. 0.7 by 0.7 mm. Staminate flowers c. 6.5 by 6 mm diam., white; pedicels 2-5 mm long; upper part above abscission zone 1-2 mm long; sepals ovate to obovate, 4.8-5.5 by 2-3 mm; petals obovate, 5-5.3 by 1.6-2.4 mm; disc lobes 1.2-1.3 by 0.5-1.3 mm; stamens: androphore c. 5.3 mm long, filaments c. 0.8 mm long; anthers ± triangular, c. 1 by 0.9 mm. Pistillate flowers not seen. Fruits c. 2.1 by 1.7 cm high; wall c. 4.3 mm thick. Seeds c. 7 by 5.7 mm; aril not observed; hilum c. 3.7 mm broad. Embryo not full-grown.
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