The world's citrus is mainly distributed in the area south of 35° north latitude. The sex is warm and humid, and the area where the large water body warms up can be pushed northward to 45° north latitude. There are 135 countries in the world producing citrus, with an annual output of 102.822 million tons and an area of 107.3 million mu, ranking first in the world.
Chinese citrus is distributed between 16° and 37° north latitude, with an altitude of 2,600 meters (Batang, Sichuan), Sanya City in Hainan Province in the south, Shaanxi, Gansu and Henan in the north, Taiwan Province in the east, and Yarlung Zangbo River in Tibet in the west. River valley. However, the economic cultivation area of Chinese citrus is mainly concentrated between 20° and 33° north latitude and below 700 to 1000 meters above sea level. There are 19 provinces (municipalities and autonomous regions) that produce citrus throughout the country, including Taiwan Province. Among them, there are 10 provinces (cities, districts) including Zhejiang, Fujian, Hunan, Sichuan, Guangxi, Hubei, Guangdong, Jiangxi, Chongqing and Taiwan, followed by Shanghai, Guizhou, Yunnan, Jiangsu and other provinces (cities). There are also plants in Shaanxi, Henan, Hainan, Anhui and Gansu provinces.
Citrus, orange and orange are three different varieties of citrus fruits, which are easily confused by people because of their similar appearance. Citrus is the general name for orange, mandarin, orange, kumquat, pomelo, and medlar. The names of mandarin and tangerine have long been confusing. According to the scientific point of view, orange is the basic species, the flower is small, the peel is good, the embryo of the seed is mostly dark green; the orange is the hybrid of other oranges such as orange and sweet orange, the flower is big, the fruit peeling is not as good as the orange peeling. The embryo of the seed is light green. Therefore, in the wide-skin citrus, orange mandarin (rice) is orange instead of mandarin, and Wenzhou citrus is orange instead of orange. Citrus and tangerine are woody plants of the same genus and different species in plant taxonomy. In addition, both mandarin and orange are commonly referred to as "citrus."
Citrus is the most important group of citrus fruit trees. There are 17 species, divided into 6 populations: big-winged orange, Yichang orange, lycium lemon, grapefruit, orange and broad-skinned orange. Citrus fruits include a large family of oranges, mandarins, pomelo, medlar, sweet orange, lime, kumquat, and lemon.