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.