Tree up to 35 m by 50 cm, with buttresses. Branchlets 0.75-3 cm thick, densely rusty tomentose, often glabrescent; pith with a peripheral cylinder of many small vascular strands. Stipules persistent, inserted near or on the base of the petiole, orbicular and dentate to oblong and repeatedly slit into 2-4 cm long lobes, specially at the base and apex, 2-9 by 1½-3½ cm, minutely tomentose, subglabrescent, nervation coarse, anastomosing. Leaves 3-8-jugate. Leaflets oblong to lanceolate, 15-40 by 5-10 cm, coriaceous, sparsely pilose to densely tomentose beneath and on the midrib above; base subequilateral, broadly cuneate to subcordate; margin dentate to serrate; apex abruptly, short and slender, acute-acuminate; nervation slightly sunken above, strongly prominent beneath; nerves 15-28 pairs (angle 55-65-90°), straight to faintly curved, gradually curving towards the margin, rarely distinctly arching; intermediate veins often strongly developed. Inflorescences axillary, together pseudoterminal (sometimes truly terminal?), laxly paniculate, densely tomentose, ♂ ones 30-50 cm long, many-flowered, female ones 15-20 cm long and with few flowers. Bracts often persistent, gradually passing into the stipules. Flowers pubescent outside, ♂ 4-7 mm long, female 8-9 mm, with a slightly concave receptacle. Calyx 3-parted, ♂ 2½-4½ mm high, female 8 mm. Stamens glabrous, ♂ adnate to the disk, female inserted on the rim of it. Disk glabrous, ♂ circular, flat, slightly concave in the center, 6-lobed, ¼-1 mm high, female adnate to the receptacle, rim 1 mm high, faintly 6-lobed. Pistil ♂ strongly reduced to none, female glabrous. Infructescences mostly broadly paniculate, 20-35 cm long, densely tomentose, with up to 40 fruits; calyx saucer-shaped, triangular, c. 1.5 cm diam. Fruits ovoid to ellipsoid, rounded triangular in cross-section, 2½-3½ by 1¾-2 cm, glabrous; pyrene smooth, faintly 3-ribbed; lids ½-2½ mm thick, bony. Seed 1; sterile cells more or less reduced.
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A medium sized tree. It grows up to 35 m high and can be 50 cm across in the trunk. It has buttresses. The small branches are 1-3 cm thick and have dense rusty coloured hairs. When cut crossways there is a ring of small vascular strands around the edge of the branch, more like in a root. The small leafy structure (stipule) near the base of the leaf stalk remains on the branch. It is split along the edge into 2-4 cm long lobes. This stipule is 2-9 cm long by 1.5-3.5 cm wide. The leaves have 3-8 pairs of leaflets. These leaflets are oblong and 15-40 cm long by 5-10 cm across. They are leathery and can have hairs along the main vein. The base of the leaflets is wedge shaped and the edges can have teeth. There are 15-28 pairs of veins which are raised underneath the leaf. The flower clusters are in the axils of leaves and near the ends of branches. The male flower stalks are 30-50 cm long with many flowers while the female are 15-20 cm long with few flowers. The flowers are hairy. The fruit clusters are 20-35 cm long with up to 40 fruit. The fruit are oval and rounded to triangular in cross section. They are 2.5-3.5 cm long by 1.7-2 cm wide. The shell is smooth with 3 ribs. There is 1 seed inside and 2 empty shells.
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