Tree 10-25 m. Twigs 3-4(-6) mm diameter, terete or faintly 2-ridged (Halmahera, Ternate, Bacan), glabrescent, hairs (0.1-)0.2-0.4 mm; older twigs coarsely striate or longitudinally cracked; lenticels copious. Leaves membranous or chartaceous, elliptic (-oblong) to (oblong-)lanceolate, 15-40(-50) by 4.5—15(—18) cm, base cuneate to slightly rounded, apex acute(-acuminate); upper surface olivaceous-brown, lower surface felty with pale brown or greyish interwoven scale-like hairs 0.2-0.3 mm, in juvenile leaves occasionally some emergent hairs to 0.4 mm (subsp. fatua), or scattered flat-lying long hairs (subsp. ajfinis); papillae not obvious; dots absent; midrib slightly raised above, lateral nerves 17-27(-30) per side, at 50-70° to the midrib, ± sunken above, lines of interarching distinct or not, venation indistinct; petiole 15-25 by 2.5-4 mm; leaf bud 12-20 by 3-4 mm, hairs 0.1-0.6 mm. Inflorescences between the leaves or below, of the Knema-type; in male: sessile or to 15 mm pedunculate, wart-or worm-like, scar-covered, simple or forked brachyblasts, rarely 3-furcate (type of M. plumeriifolia), 5 to 15 (-20) mm long, with subumbel(s) of 5-10 flowers, buds of variable sizes, pedicels ± curved upward; bracts early caducous; female inflorescences shorter; flowers with rust-coloured hairs 0.3-0.6 mm. Male flowers: pedicel 5-8 mm, bracteole subpersistent or caducous, 2-3 mm; buds ellipsoid or obovoid, (4-)4.5-6 by (3-)3.5-4 mm, cleft about 1/2, lobes 0.3-0.8 mm thick. Androecium ± cylindrical, 2.5-4.5 mm; androphore 1-1.5 by 0.6-0.7 mm, subglabrous (hairs scattered, 0.3 mm) to densely pubescent; synandrium 2-3 by 0.8-1.2 mm, thecae 12-20, sterile apex absent or to 0.5 mm. Female flowers: pedicel 4 mm; buds ovoid, 4-5 by 3.5-4 mm, cleft 1/2; ovary broadly ovoid, 2.5 mm long, brown pubescent. Infructescence short. Fruits solitary or 2 together, broadly ellipsoid or ellipsoid(-oblong), 4-7 by 3-5.5 cm, hairs dense, velvety, rust-coloured, 0.5-1 mm; pericarp (3-)4-12 mm thick; seeds ellipsoid to oblong, 3-3.5 cm; fruiting pedicel slender or stout, 3-10 mm long.
Usually found as a canopy tree in a wide variety of habitats, especially swamp forests, in primary or secondary forest, at elevations from near sea level to 1,600 metres.
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