Douli is a kind of arbor with a height of about 5-8m. The trunk of the tree is cylindrical and has soft hair when it is young. It will gradually fall off in the process of growth. The biennial branches are grayish brown, and the buds in winter are triangular ovate.
It is also a kind of tree, but its height is about 10 m. Its biennial branches are purplish brown, and its winter buds are oval.
The leaves of Douli are wide oval, about 4-8cm in length and 3.5-6cm in width. Its petiole is about 2-4cm long, with no villi on it.
The leaves are rhomboid and ovate, about 4-8cm in length and 2.5-3.5cm in width, which are slightly longer than those of the former. Its petiole is about 2-3cm long with hairs on it.