1, the trunk is usually straight; Bark is smooth or longitudinally dehiscent, usually grayish white. There are terminal buds with many scales, which are often sticky. Branches are long (including sprouted branches) and short, cylindrical or ridged.

2. Leaves alternate, mostly ovoid, ovoid-lanceolate or triangular-ovoid, with different shapes and toothed edges on different branches (such as long branches, short branches and sprouting branches); Petiole long, lateral flat or cylindrical apex with or without glandular points.

3. Inflorescence droops and leaves often open first; Male inflorescence opens earlier than female inflorescence; Bract apex acute or dehiscent, membranous, caducous, disk tilted cup-shaped;

4. The male flower has 4-4 stamens, inserted in the disk, with dark red anthers and short and free filaments; Ovary style short, stigma 2-4-lobed. Capsule 2-4(5) cracked. The seeds are small and numerous, and the cotyledons are oval.

Extended data:

Poplar is a forest tree species scattered in temperate and cold temperate zones in the northern hemisphere. In China, it is distributed between 25 ~53 degrees north latitude and 80 ~ 134 degrees east longitude, that is, it is distributed in central China, north China, northwest China and northeast China. The rest of the world lies in the range of 30 ~72 degrees north latitude.

The industrial utilization of poplar mainly includes: large-diameter poplar is mainly used to produce plywood, laminated veneer lumber and furniture; Small-diameter poplar is used to produce fiberboard, particleboard, paper making and matches.

Poplar can be widely used in ecological protection forest, three-north protection forest, agriculture and forestry protection forest and industrial timber forest. Poplar is an excellent tree species for road greening and landscape.