Tangerines are the fruit of certain plants in the subfamily Citrus of the family Rutaceae. Mandarin, tangerine and orange are three different varieties of citrus fruits that are easily confused because of their similar appearance. Citrus, is a tangerine, mandarin, orange, kumquat, pomelo, hedgehog, etc., the name of citrus and tangerine has long been very confusing. According to the scientific point of view, tangerine is the basic species, with small flowers, good peeling, and dark green seed embryo; tangerine is a hybrid of tangerine and other citrus, such as sweet orange, with large flowers, and the peeling of fruit is not as good as that of tangerine, and the embryo of the seed is light green color. Therefore, in the wide-skinned tangerines, orange tangerines (rutabagas) are tangerines but not mandarin oranges, and Wenzhou mandarin oranges are tangerines but not mandarin oranges. Citrus and tangerine are taxonomically the same family and genus but different species of woody plants. In addition, tangerines and oranges are often collectively referred to as "mandarin oranges". The genus Citrus is the most important group of citrus fruit trees, *** there are 17 species, divided into six species groups: the large-winged oranges, Yichang oranges, citrus lemons, pomelos, oranges, and broad-skinned oranges. Citrus fruits include a large family of oranges, tangerines, grapefruit, citrons, sweet oranges, limes, kumquats and lemons. In order to facilitate the distinction, the characteristics of tangerines, oranges, oranges and grapefruit are as follows: 1. Tangerines: the mature fruit of various citrus species such as tangerines of the Brassicaceae family. The fruit is larger, nearly spherical, with yellow, orange or orange-red skin, thick rind, thick spongy layer, loose texture, slightly difficult to peel, and ovoid seeds. Taste sweet and sour moderately, storage resistance. 2, tangerine: tangerine, for the Rutaceae plant Fukui orange or vermilion orange and other kinds of orange ripe fruit. There are many species, including eight cloth orange, money orange, sweet orange, sour orange, Miyagawa, Xinjin orange, Ojang orange, Wenzhou orange, Sichuan orange and other varieties. The fruit is small, often oblate, with orange-red, vermilion or orange-yellow skin color. The pericarp is thin and loose, the spongy layer is thin, tough and easy to peel, and there are 7 to 11 vesicles. Sweet or sour taste, the seeds are pointed and thin, not resistant to storage. 3, orange: refers to the Brassicaceae, Citrus subfamily, Citrus genus, Citrus subgenus below a group of plants. Varieties of brocade orange, navel orange, etc.. Commonly refers mainly to sweet orange. Zhongyu No. 7 Sweet Orange" is a new sweet orange variety selected and developed by Citrus Research Institute of Chinese Academy of Agricultural Sciences, which is nuclear-free, high-quality, high-yield, storage-resistant, fresh food, processing (juice) and dual-purpose sweet orange. The fruit is round or oblong, with smooth and thin skin, and the capsule is tight and not easy to be peeled off. The meat is moderately sweet and sour, rich in aroma. 4, pomelo: pomelo is one of the citrus fruits, but also one of the largest fruit. Rutaceae plants for the evergreen fruit tree pomelo tree ripe fruit, also known as Zhu Luan, Lei Pomelo, gas citrus, Wendan, fragrant Luan, Zhu Luan, within the purple, Zafan, quarters citrus, stinky orange and so on. There are 3 kinds of white hearted pomelo, red hearted pomelo and Shatin pomelo. Such as Shatin pomelo, the skin is actually not too thin, the appearance of the skin is not particularly smooth kind, the fruit type is also pear-shaped mostly. The fruit part of the pomelo is very tight, it is very difficult to break open, eat Shatian pomelo with a knife to cut, every piece of flesh of the pomelo is wrapped complete, the peel will not blow open. The flavor is pure sweetness, sweetness without any accidental unadulterated feeling, and not much slag. The richness of the juice is not particularly watery kind, but also good. Shatin pomelo is usually a catty or two, not more than three or four catty. And honeydew is casually three or four pounds of a, but also large and round, and feel the skin is very smooth, if the same honeydew and shaddock pomelo put together to compare, the feeling will be more obvious difference is not small. The honeydew is very juicy, richer than the shaddock.