Citrus is a small tree of Rutaceae and Citrus, with dense branches and leaves and many thorns. The leaves are dark green, thick, with obovate wings and a narrow base. Racemes have few flowers, and the buds are oval or nearly spherical. The fruit is round or oblate, the peel is slightly thick to very thick, difficult to peel off, orange to vermilion, the core is solid or semi-full, the pulp is sour, sometimes bitter or with special smell, and there are many and large seeds.

Lime is native to the south of the southern slope of Qinling Mountain in China. This species is widely used as a rootstock for grafting sweet oranges and wide-peel oranges. It is a stomach tonic, tonic, wind expelling agent and correctant, and can be used for treating common cold, dyspepsia, cough with excessive phlegm, uterine prolapse and proctoptosis.

Extended data:

The fruit contains flavonoid glycosides, lactone, alkaloid and organic acid. There are hesperidin, naringin, isocorhinoside -7- rutin glycoside, naringin -4'- glucoside -7- rutin glycoside, naringin, limonin -3-β-P- glucoside and O-D- xylo-vitexin in flavonoid glycosides.

There is a bitter component limonin in lactone, namely phellodendron lactone and its derivative limonin monolactone. The alkaloid is narcotine. Citric acid and malic acid are the main organic acids. It also contains phloroglucinol -β-D- glucoside, sugars, vitamins, calcium, phosphorus and iron. The peel also contains volatile oil1.5 ~ 2%, and its main components are n-decanal, citral, limonene and octanol.

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