Poplar leaves are oval in shape, with short tips and sharp tips, so they look like a heart. Poplar leaves are emerald green and shiny, about 7- 10cm long, and the edges of the leaves have tiny serrations. Leaves also have many uses, which can be used as feed for livestock or as fuel after drying.

Trunk usually ends straight; Bark is smooth or longitudinally dehiscent, usually grayish white. There are terminal buds (Populus euphratica has no buds), and the bud scales are mostly sticky. Branches are long (including sprouted branches) and short, cylindrical or ridged. Leaves alternate, mostly ovoid, ovoid-lanceolate or triangular-ovoid, and often have different shapes and toothed edges on different branches (such as long branches, short branches and sprouting branches); Petiole long, lateral flat or cylindrical.

Poplar classification

1, poplar group: bark is usually gray and smooth, only the base of old trees is rough. Buds villous or smooth.

2. Populus davidiana group: The bark is flaky and rough. The bud is conical, slightly sticky and smooth. Short branches and long branches are nearly round, and the base is heart-shaped or deeply heart-shaped; The petiole is only slightly flattened at the apex.

3. Populus davidiana group: longitudinal cracking of bark. Buds are big and sticky, with a strong fragrance. The top of leaves is green and the bottom is usually white. The long and short branches and leaves have different shapes, the base is wedge-shaped, round to shallow heart-shaped, and the edges are opaque and narrow.

4. Populus deltoides group: longitudinal cracking of bark. Buds are sticky. Leaves are usually triangular or diamond-shaped, with a long, pointed tip, a truncated or wide wedge-shaped bottom, serrated edges and a transparent narrow edge. Both sides are green and have pores.