Introduction of poplar
Poplar, also known as Salix, belongs to Salicaceae and grows mostly in Liaoning, Xinjiang and Northeast China. At present, there are 57 species of willow distributed in China. Willow is divided into five groups: Populus cathayensis, Populus euphratica, Populus nigra, Populus euphratica and Populus macrophylla. The leaves on the top of Populus cathayensis are green, and the ones on the bottom are white.
Populus davidiana has strong fragrance and round or shallow heart-shaped leaves; The bark of Populus tomentosa is mostly gray-white, with smooth surface and rectangular fruit. The leaves of Populus euphratica have many changes. The leaves are gray-blue on both sides, with pores under the leaves and round petioles.
The bark of Populus deltoides has longitudinal cracks, the leaves are triangular oval or rhombic oval, and the leaf margin is serrated; The leaves of Populus davidiana are mostly flaky with cracks, but the leaves are smooth. Poplar has strong adaptability and is the most widely distributed plant in the world.
Characteristics of poplar
The trunk of willow is straight and the bark surface is mostly smooth. Some bark surfaces have longitudinal cracks, and their leaves are oval, oval-lanceolate, triangular-lanceolate and other shapes. Willow leaves first and then flowers, and the male flowers bloom much earlier than the female flowers.