Citrus belongs to Rutaceae, which is a kind of wild evergreen tree, 3 meters high, with thick and straight trunk, umbrella-like crown and spectacular appearance. May flowers, white and fragrant. The results in October are flat and round, generally weighing100-170g, orange in color, thick in skin, wrinkled, neat in meat flap, sour and fragrant, and can be stored for 3 months if it is intact. In the past, monks and nuns in the mountains used to offer sacrifices to Buddha, which was called "Xiangyuan". It can also be used as a formula of traditional Chinese medicine, and has the effects of promoting digestion, lowering qi, stopping nausea and resolving phlegm. 1April, 1980, tested in the breeding room of the Fruit Research Institute of Sichuan Academy of Agricultural Sciences, the orange contains 2.62% sugar, 5.59% acid, 39.19% vitamin C and 9.5 solids, so it is a nutritious fruit.

The orange fruit is oblate or pear-shaped, with different sizes, the big diameter is 8 cm, and the small one is about 4 cm. There are annular protrusions and shallow radial grooves at the top of the fruit, and sometimes radial grooves at the pedicle. The peel is rough, the pits are uniform, the oil cells are large, and the skin thickness is 2-4 mm.

Pale red, easy to peel off, ladle capsule 9- 1 1 petal, thick and tough capsule wall, yellowish white pulp, very sour taste, often bitter or peculiar smell; There are as many as 40 seeds, which are broadly ovoid, full and smooth, with ivory cotyledons and single or multiple embryos. The flowering period is from April to May, and the fruiting period is 10- 1 1 month.