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shell fighting section. Deciduous trees, bark gray, with deep ditches, small branches with hair. The leaves are round or long round, with jagged jagged teeth on the edges, green on top, shiny on top, and gray-white hair on the bottom. Flower monosexual, male and female, male flowers into an upright spike-shapedflower sequence, flowers are 6 cracked, male 10 to 20; Nuts 2 to 3, brown, the top often has short soft hair, born in the shell of the formation of the total crucifida, when ripe the total crucifida 4 cracks. It is distributed in Hebei, Shandong, Shanxi, Shaanxi, Jiangsu, Zhejiang, Jiangxi, Hubei, Sichuan, Yunnan, Guizhou and other provinces and regions. It is widely cultivated all over the world. For one of the important dried fruits in mountainous areas, woody grain; wood hard, can be made of pillows, appliances; bark can extract danning and dyes; leaves can be reared silkworms; male flower sequence, shell, bark can be drugged, has anti-swelling and detoxification effect.