Trees, more than 40 meters high and 40 cm in diameter at breast height. Annual branchlets are yellow-brown, annual branchlets are grayish-brown, all hairless, and usually blue-purple-black when dry. The terminal bud is ovoid, the scales are nearly round, the outer part is densely covered with grayish yellow silk hairs, and the proximal part is hairless and light brown. The leaves are elliptic or oblanceolate, with a length of 5- 10( 13.5) cm and a width of 2-5 cm. The apex or tail are tapered, the apex is blunt, the base is wedge-shaped, the top is leathery, green and hairless, with appressed pubescence at the bottom, the tender leaves and petioles are densely grayish yellow pubescent, and the midvein is sunken at the upper part. Petiole slightly thinner, long 10- 15 mm, hairless, with shallow grooves on it.

Panicle is born at the base of the twig, about 4-7, 5-6.5(9) cm long, with grayish yellow hairs, branched at the upper end, and the total stalk is 3-5 cm long; Pedicel slender, 5-7 mm long; The flowers are small and greenish, about 3 mm long and 4-5 mm in diameter. Perianth lobes are oblong, with filiform hairs outside and sparse filiform hairs inside, with 3-5 longitudinal veins. The glands of the third round stamens are halberd-shaped, with stalks and hairs at the base of staminodes. Ovary oval, slender style, all glabrous, stigma slightly enlarged. The fruit is oblate, black and about 7-8 mm in diameter. The flowering period is from April to June, and the fruiting period is from July to August.