Trees, 20-35 m tall, 30-65 cm d.b.h. Branchlets 4-9(-15) mm in diam., brown tomentose when young, glabrescent, lenticellate, with conspicuous leaf scars. Leaves stipulate; stipules subulate or linear, 7-25 mm, tomentose; leaflets 2-5 pairs; blades broadly ovate or lanceolate, (6-)9-18(-20) × 3.5-11 cm, adaxially sparsely pubescent on midrib, abaxially tomentose or rarely nearly glabrous, papery or leathery, base rounded or cuneate, sometimes oblique, margin shallowly serrate or sinuate, apex acuminate, with acumen blunt or acute; lateral veins 12-20 pairs, abaxially prominent. Inflorescences axillary, narrow cymose panicles 7-25 cm in male plants, racemose and 8-10 cm in female plants, scattered villous. Flowers 7-11 mm, slender, puberulent. Calyx 2.5-3.5 mm, shallowly lobed. Stamens glabrous; filaments connate for ca. 1/2 of length in male flowers, stamens smaller in female flowers; disk fimbriate, in male flowers thickly annular, ca. 1 mm high, center sometimes excavated, in female flowers annular, 6-lobed. Ovary with upper part ± pubescent or glabrous, absent in male flowers. Infructescences 2.5-8 cm, 1-4-fruited, tomentose; persistent calyx disk-shaped, (6-)15 mm in diam., shallowly 3-lobed, lobes often recurved. Drupe ovoid or ellipsoid, up to 4.5 cm, sparsely pubescent or glabrescent, cross section rounded; cross section of pyrene rounded triangular. Fr. Sep.
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A large tree. It grows up to 30 m high and is 60-80 cm across in the trunk. The trunk is straight. The bark is split into small pieces along its length. The bark is dark grey. The small branches are rough with yellow brown hairs. The leaves are unequal and 20-30 cm long. There are 3-6 pairs of leaflets. They are oval and thin. They are 7.5-9.5 cm long by 3-4.5 cm wide. They end with a sharp point. They are rounded or wedge shaped at the base. The edges of the leaves can be wavy. There are 11-12 pairs of side veins. The leaflet stalk is 1 cm long. The leafy structure (stipule) at the base of the leaf stalk is 1 cm long and covered with fine hairs. The leaves turn red when old. The flower clusters can be in the axils of leaves or near the ends of branches. There are few flowers without flower stalks and they are 6 mm long. The fruit is large and oval. It is 3.5 cm long and 2 cm wide. It is green when young.
A tropical plant. It occurs in Vietnam in evergreen forests. It needs light when young so seedlings are only found in open places. In southern China it grows in valley forests between 200-1,500 m above sea level. In Yunnan.
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Semi-open forests, often with bamboo.
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