Tree, up to 35 m tall,bark dull gray. Buds sticky. Young shoot terete, glabrous. Leaves on long shoots larger, broadly deltoid to deltoid, usually broader than long, truncate or rounded at the base, crenate, acute to acuminate. Leaves on short shoot smaller, rhombic ovate, longer than broad, cuneate at base, crenate-serrate, acuminate. Peiole 2.5-6 cm long, glabrous, lamina 5-10 (-12) x 4-8 (-15) cm. Male catkin 5-7.5 cm long; bracts brownish, 3-4 mm. Stamens (6)-15-30, anthers purple. Female catkin 5-10.5 cm. Ovary glabrous, stigmas 2, sessile, broad, obcordate. Fruiting catkin (5)-10-16 cm long. Capsule shortly stipitate, 2-valved, 5-7 x 3-4 mm.