Tangerine, or "tangerine", is a fruit of the genus Citrus in the family Rutaceae, and "tangerine" is commonly written as "orange".

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Vitamin A in oranges also enhances the body's ability to see in dark environments and treats night blindness. Oranges should not be eaten in excess, eating too much will suffer from carotenemia, the skin is dark yellow, as jaundice. If the palms of your hands turn yellow as a result of eating too many oranges, just stop eating for a period of time and your skin color will gradually return to normal. Ming Dynasty Zhang Dai quarter uncle Zhang Ye Fang is fond of oranges, according to its "sex is good to eat orange, orange cooked, stacked between beds, no non-oranges, since the publication does not give, always order a number of boys ring Li peeled", eat to the hands and feet are yellow.

Tangerine originated in China, thousands of years of cultivation history can not say the exact location. By the Arabs spread throughout Eurasia, orange in the Netherlands, Germany are still known as "Chinese apple". China is one of the important origin of orange fruit, citrus resources, excellent varieties, there are more than 4000 years of cultivation history. According to evidence, until 1471 A.D., tangerines, mandarins, oranges and other citrus fruit trees from China to Portugal, 1665 A.D. was introduced to the United States.

The world citrus is mainly distributed in the region south of 35 ° north latitude, sex like warm and humid, there is a large body of water warming the territory can be pushed north to 45 ° north latitude. There are 135 countries in the world to produce citrus, annual output of 102.822 million tons, an area of 107.3 million acres, the first fruit of the number of production of Brazil, there are 24.2526 million tons, the second number of the United States, there are 16.3352 million tons, China's third, there are 10.78 million tons, and then after Mexico, Spain, Iran, India and Italy and other countries.

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