1, Betula platyphylla, also known as Betula platyphylla and Betula platyphylla, is a deciduous tree with a height of 25m, a DBH of 50cm and an oval crown. Like light, not tolerant of shade, cold-resistant. It is produced in Daxing 'anling, Xiaoxing 'anling, Changbai Mountain and cold areas in North China.

2. Birch is a deciduous tree, with a height of 25 meters and a DBH of 50 cm, and an oval crown. The bark is white, peeling like paper, and the lenticels are yellow. Branchlets are thin, reddish brown, glabrous and covered with ash. The leaves are triangular-ovate or rhomboid-ovate, with irregular double serrations on the green side and sparse oil glands on the back. Infructescence solitary, pendulous, cylindrical. Nuts are small and flat with wide wings on both sides. The flowering period is May-June, and the fruit ripens in August-65438+10. Flowers are unisexual and all form catkins. Infructescence is cylindrical, pendulous, with smaller wings and wider nuts. The membranous wing of nutlet is longer than the fruit 1/3, less than or equal to it, equal to or slightly wider than the fruit.