Tree 10-25 (-40) m. Twigs towards apex often drying flattened, usually thinly ridged, (2-)3-10 mm diameter, glabrescent, indumentum minute to conspicuous (New Guinea and Pacific Islands), grey to rusty, dendroid hairs of mixed size, 0.1-0.5(-l) mm long; bark (coarsely) striate, ± blackish, not flaking; lenticels conspicuous. Leaves often ± curved towards the apex, membranous, elliptic-oblong to lanceolate, 10-30(-35) by 3-7(-9) cm, base rounded to attenuate, apex acute-acuminate; upper surface drying dull, greenish to blackish, almost always with irregular whitish marks of unknown origin, lower surface early glabrescent; dots absent; midrib flattish above; nerves 10-20 pairs, thin and flattish above, lines of interarching usually indistinct; venation lax, faint above, thin though distinct beneath; petiole 7-16 by 1.5—3(—4) mm; leaf bud 10(—15) by 2-3 mm, with hairs 0.1-0.5(-l) mm. Inflorescences with dense hairs 0.1-0.5(-l) mm long, persistent or glabrescent; in male: 3 or 4 times branched, many-flowered, 4-18 by 3-7 (-10) cm; in female: 2-6(-8) cm long, 2 (or 3) times branched; peduncle 0.5-4.5 cm long; bracts ± acute, 1.5-4 mm long (sometimes larger, leaf-like), caducous; flowers in male in clusters of 3-10, in female fewer; perianth 2-lobed, glabrous, at base glabrescent; pedicel pubescent or glabrescent, not articulated. Male flowers: pedicel slender, 0.1-1.5 mm; buds subglobose or ± transversely ellipsoid, somewhat laterally compressed or not, 1-1.5 by 1-1.5 mm (largest in Indochina), apical part broadly rounded, base rounded or short-tapering, cleft 1/2-2/3, lobes 0.2 mm thick; androecium ± broadly obovoid, 0.8-1.2 by 1-1.5 mm (Plate 1: 2); thecae 12-18(-20, Indochina), not closely touching, 0.5-0.8(-l) mm long, free apical part 0.2-0.3 mm, incurved, column and androphore broadly concave, more or less saucer-or cup-shaped, 0.4-0.5 by (0.5-)0.6-1 mm, tapered towards the base. Female flowers: pedicel 1-4 mm long; buds obovoid or ellipsoid, 1.5-2.3 by 1.3-2 mm, cleft 1/4-1/3; ovary broadly obovoid, glabrous, 1.2-1.5 by 1-1.3 mm, stigma minute, 0.1 mm. Fruits 2-8 per infructescence, globose, 1.5-2.2 cm diameter, glabrous, finely granular, without tubercles or lenticels, drying dark brown to blackish; pericarp 1-2 mm thick; seeds globose; fruiting pedicel 5-10 mm long; perianth not persistent.
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A tree. It grows 10-45 m tall. The stem has red sap. The branches extend out parallel to the ground. The leaves are alternate and simple. They are narrowly oval and 25 cm long. The flowers are 2 mm across. They are yellow. They occur in groups. The fruit are 17 mm across. They are yellow to orange. They are smooth capsules. The seeds have a red fleshy layer or aril around them.
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