It belongs to the plant of the rutfamily. Likes the warm and humid climate, cold resistance than grapefruit, lime, orange. The rutac family of Citrus subfamily is distributed at 16 degrees ~37 degrees north latitude. It is tropical and subtropical evergreen fruit tree except for trifoliate orange, and has 3 genera for economic Cultivation: trifoliate, citrus and kumquat. Citrus is the main cultivated citrus in China and other countries in the world. Flowers solitary or 2-3 clustered, calyx irregular, 5-3 - lobed, petals usually less than 1.5 cm, stamens 20-25, styles long, stigmas capitate. The flowering period is 4-5 months, and the fruit period is 10-12 months.
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