Tree up to 31 m high and 50 cm Ø (up to 50 by 2 m, cf. ROYEN, AC). Occasionally with steeply rising buttresses 1-3 m high. Bark grey brown to dark red, smooth, peeling off in small round scales. Leaves coriaceous, elliptic, broadly elliptic, or obovate-oblong, 7-20½ by 3-10½ cm, glabrous; base cuneate; apex rounded, slightly emarginate, rarely cuspidate; nerves 12-17 pairs, slightly elevated below, distinct above; veins reticulate, distinct or faint beneath, faint above; petiole 1-2½ cm. Panicles up to 30 cm long, puberulous when young, glabrescent, or glabrous; pedicels articulated, 1-3 mm. Flower-buds ovoid or ellipsoid, 3-3½ by 1½-2 mm, obtuse. Calyx 3-3½ mm long, bursting irregularly, glabrous except sparsely hairy at the apex. Petals white, imbricate, elliptic or obovate-oblong, 6½-7½ by 2½-3 mm. Stamens 5 (or 6), 4½-5 mm; filaments glabrous; anthers oblong, c. 1 mm long. Torus cylindric, ⅔-1 Ovary, c. ¾ mm ø, glabrous; stipe ⅔-1¼ mm; style lateral, 2-2½ mm. Drupe on an obscure, excentric stalk, bent almost horizontally, subreniform, 6½-8 by 5-5¼ by 2-2½ cm, light to dark brown, (recorded bluish black when fresh), smooth; without enlarged petals; embryo subreniform, 3½-4by 5½-7 by 1¼-2¼ cm; cotyledons incompletely fused, free on one side, free part 3-3¾ cm deep.
Seasonally inundated forests along rivers, freshwater swamps, forests on well drained soils, or secondary forest. Fl. Febr., Oct.; fr. March, June, Sept.
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Seasonally inundated forest along rivers, in freshwater swamps and on well-drained soils at elevations up to 50 metres.
Uses. The thin, moderately hard, reddish brown, grained heartwood has been used specially for keels of canoes and for carving, and is also suitable for corbels and sleepers (cf. C. L. LEEFERS Verslag van Bosopname Boven-Digoel typed report 1958 appendix 1 ).
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