Tree up to 40 m by 60-70 cm, sometimes with up to 1 m high buttresses. Branchlets 0.5-1 cm diam., rusty-tomentose; pith with a peripheral cylinder of scattered vascular strands. Stipules subpersistent, sometimes caducous, sometimes inserted on the base of the petiole at 0.25-0.75(-3) cm or even slightly on the twig, 6-8 by 10-20 mm, deeply 3-4-lobed, stiff, densely and minutely fulvous-tomentose. Leaves (3-)4-5-jugate. Leaflets obovate, lanceolate or oblong, 9-20 by 4.5-8.5 cm, coriaceous, often chartaceous, glabrescent; base oblique, sometimes near equal-sided, cuneate to cordate; margin entire, sometimes serrulate near the apex; apex gradually to abruptly, shortly and slenderly acute-acuminate; nerves (10-)13-19 pairs (angle 60-70°), faintly curved, abruptly, usually distinctly, arching close to the margin. Inflorescences pseudoterminal to terminal, terminal ones broadly and laxly paniculate, 25 cm long (female), main branches up to 9 cm, with few flowers; pseudoterminal ones narrowly paniculate, 25-30 cm long (male), main branches 6-11 cm, paniculate, c. 10-flowered; minutely tomentose. Flowers pubescent, ♂ 11 mm, female 13-15 mm. Calyx broadly cupular, ♂ 7 mm, female 9 mm. Corolla female pubescent at both sides, ♂ inside glabrous. Stamens adnate to the disk, filaments glabrous. Disk glabrous, ♂ saucer-shaped, 1 mm high, rim undulate, female cupular, 2.5-3 mm high, truncate. Pistil long-pilose; ♂ none. Infructescences c. 25 cm long, sparsely tomentose, with 4-5 fruits; calyx saucer-shaped, 3-lobed, 2-2.5 cm diam. Fruits ellipsoid, sometimes acute, bluntly triangular in cross-section, 5-5.5 by 3.5-4 cm, sparsely, near the apex densely, ferrugineously tomentose; pyrene smooth with 3, blunt to acute, angle-ribs, specially near the apex; lids 1-2 mm thick. Seed 1, spindle-shaped, acuminate at base, 4 by 1.5 cm; fertile cell in cross-section circular, 1.5 cm diam., sterile cells strongly reduced, without lumen.
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A large tree up to 40 m high. The trunk can be 60-70 cm across. It does not have buttresses. The small branches are 0.5-1 cm thick. They have rusty hairs. The leafy structures (stipules) on the leaf stalks are 0.5 cm from the base and deeply 3-4 lobed. The leaves have 4-5 pairs of leaflets. The leaflets are oval or long and 9-20 cm long by 4-8 cm wide. They are leathery and the base is wedge shaped while the tip tapers to a point. There are 13-19 pairs of faint slightly curved veins. The flower clusters are near the ends of branches. These are 25 cm long for female clusters and 25-30 cm long for male flower clusters. Male clusters have about 10 flowers while female clusters have few flowers. The fruit clusters are 25 cm long and with 4-5 fruit. The fruit are oval and triangular in cross section. The fruit can be 5 cm long. The seed are thin and long. They are 1.5 cm wide.
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