Tree 25-30(-43) m by 40-100 cm. Branchlets 0.5-0.75 cm diam., sparsely tomentose or glabrescent; pith dark-brown, hard, with a peripheral sclerenchymatic cylinder (vascular strands usually invisible). Stipules none. Leaves 2-7-jugate. Leaflets oblong-elliptic to ovate, 4-13(-15.5) by 2-5(-9) cm, rigid, subcoriaceous, subglabrous to more or less pubescent, specially on the prominent nerves beneath; base nearly equilateral, rounded to sub-cordate; margin often revolute, fimbriate, serrate (rarely dentate or repandous) to entire; apex acute to rounded, rarely emarginate; nerves 11-16(-18) pairs (angle c. 65°), straight or more or less irregularly curved, sometimes arching close to the margin. Inflorescences (female unknown) terminal, broadly paniculate, 10-30 cm long, densely rusty pubescent, main branches up to 13.5 cm, broadly paniculate, many-flowered. Bracts subulate. Flowers (female unknown) c. 1 cm long, pubescent. Calyx 8-9 mm. Petals unguiculate, apex inflexed-acuminate, incrassate. Stamens free, glabrous. Disk cup-shaped, 1 mm high, densely erect-pilose. Pistil none. Infructescences terminal and sometimes in the upper leaf-axils, 6-8 cm long, rusty tomentose to glabrous, with 1 fruit; calyx saucer-shaped to cupular, deeply 3-lobed, 12-15 mm diam., with the remains of 6 stamens and a 1-2 mm high, faintly 6-lobed, rusty long-pilose disk. Fruits ovoid, acuminate, circular in cross-section, 4-5 by 2-2¾ cm, fulvously tomentose, specially near the base and apex; pyrene rounded in cross-section, angle-ribs blunt, lids with a faint median rib each; lids up to 7 mm thick, very hard. Seeds 1(-2); sterile cells nearly invisible.
Primary forests up to 200(-500) m. Fl. Febr. (Mal. Pen.), May-June (Borneo); fr. May (Mal. Pen.), Aug. (Borneo), Nov. (Sum.).
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