Arbor, 10-25 (- 35) meters high, diameter at breast height up to 150 cm. Branchlets 5-6 mm thick, young parts covered with yellowish brown tomentose, quickly becoming glabrous; There are columnar vascular bundles around the medulla, and a few vascular bundles are scattered in the center.

Stipules, present only in bud, borne on branches near the base of petiole.

Leaflets 3-6 pairs, papery to leathery, lanceolate or elliptic (to ovoid), 6-14 cm long, 2-5.5 cm wide, glabrous or bristles scattered on the back veins, with extremely small verrucous protrusions on the back;

Apex acuminate to abruptly narrow acuminate, cusp about 2 cm long, obtuse; Base cuneate to round, oblique, entire; The lateral veins are 12-16 pairs, and the midvein is developed.

Inflorescences axillary, minutely tomentose to glabrous; Male inflorescences are cymose panicles, 15-30 cm long, many flowers; Female inflorescences are racemose, 3-6cm long, with less than 12 flowers.

Flowers sparsely tomentose to glabrous, male flowers 5.5-8 mm long, female flowers about 7 mm long; Calyx 2.5-3 mm long, with 3 shallow teeth on male flowers, nearly truncate on female flowers;

Stamens 6, glabrous, filaments connate more than 1/2 (several full length connate in female flowers); Disk spherical to cylindrical in male flowers, 1-1.5 mm high, slightly 6-lobed, with or without holes in the center, and a few setae on the upper part;

Annular in female flowers, slightly 3-wavy teeth, 1 mm high, thick fleshy, inside sparsely pilose. Pistil densely pubescent; Small or lacking in male flowers.

Infructescence 1.5-15cm long, with 1-6 fruits. Calyx flat, 0.5 cm in diam., calyx teeth decurved. Fruit ovoid to spindle shaped, nearly round in cross section, 2.5-3.5 cm long, glabrous, yellow green when mature;

Exocarp thick, wrinkled when dry; The fruit stone is acuminate, the cross section is round to hexagonal, there is a shallow groove between the blunt costal angle and the nuclear cap, and the nuclear cap has a slightly raised middle rib, the outside is shallow wavy;

The nuclear cap is 1.5-2 (- 3) mm thick. Seeds 1-2, sterile room slightly degenerated. The flowering period is from April to May, and the fruit ripens from October to December.