The bark is dark gray, rough, and irregularly split. The young branches stand upright and are covered with white hairs; the apex of the old branches is drooping, and sometimes the cork is developed into a nodular shape. Deciduous trees, up to 30m. The leaves are obovate-elliptic or broadly obovate, apex sharply pointed, base wedge-shaped, oblique, 8cm-12cm long, 3cm-7cm wide, leaf margins with heavy serrations and cilia, dark green on the upper surface and light green on the underside; vein feathers Shape, 15 pairs to 20 pairs of lateral veins; petioles densely or sparsely white short hairs. The flowers open in early spring, with fascicular cymes on the old branches, dark purple; the flowers are bisexual; the calyx is bell-shaped, 4-lobed; 4 stamens, and the pistil is composed of 2 carpels. The samara is flat, obovate, glabrous or hairy only at the top depression; the seeds are located on the upper part of the samara, the upper end is close to the depression, and the surrounding is membranous wings. Flowering period from April to May; fruit maturity period from May to June.