Zizyphus jujuba is the monarch, also known as black jujube, a tree with a height of 5-10 m; Bark is dark brown and deeply split into square blocks; Young branches are gray pilose. The leaves are oval to oblong, 6-12 cm long and 3-6 cm wide. The surface is densely pilose and then falls off, the back is gray or pale, and the veins are pilose. Flowers pale yellow or reddish, solitary or clustered leaf axils; Calyx densely pilose, 4-parted, lobes ovate. The fruit is nearly spherical, with a diameter of1-1.5 cm. When ripe, it is blue-black, with a layer of white wax and nearly sessile. Flowering in May, fruit ripening period 10— 1 1 month. Produced in mountainous areas, wild in hillsides, valleys or cultivated; Distributed in Liaoning, Hebei, Shandong, Shaanxi, Central South and Southwest China. Black dates are not dates, but persimmons. The Chinese name is Diospyros Iotus Linn, which belongs to Persimmon family and persimmon genus, and is also called soft dates, milk dates, wild persimmons and lilac dates.