elm

Deciduous tree, 25 meters high, 1 meter diameter at breast height, grows into shrubs in dry and barren land; young trees have smooth bark, gray-brown or light gray, large trees have dark gray bark, irregularly deeply split, rough; no branches Hairy or hairy, light yellow gray, light brown gray or gray, light brown yellow or yellow, with loose skin holes, no enlarged cork layer and raised cork wings; winter buds are nearly spherical or ovoid, buds The back of the scales is glabrous, and the edges of the inner bud scales are white pilose. The leaves are oval-ovate, long-ovate, elliptic-lanceolate or ovate-lanceolate, 2-8 cm long, 1.2-3.5 cm wide, apex acuminate or long acuminate, base deviated or nearly symmetrical, one The side is wedge-shaped to round, the other side is round to semi-heart-shaped, the leaf surface is smooth and glabrous, the back of the leaf is pubescent when young, later becomes glabrous or part of the vein axillary has tufted hairs, with heavy serration or single serration on the edge The veins are 9-16 on each side, and the petiole is 4-10 mm long, usually with pubescent hairs only. The flowers bloom first and form clusters in the leaf axils of the branches.