Hello! The relationship between these three is like this. Longan is cinnamon, which is the same thing. Lychee is something else. Longan (Gui Yuan) and Lychee are two different things belonging to the same family and different families. However, longan and the cinnamon you just mentioned are indeed the same thing. I: Longan: The scientific name of longan is Gui Yuan. There are many aliases for longan, such as Longan, Yi Zhi, Li Zhu and Yuan Meat. As shown in the picture: Longan (Gui Yuan) /21/54/01300000180919121543549744046.jpg Longan is the common name of Gui Yuan. There are many aliases for Gui Yuan, such as Longan, Yi Zhi, Li Zhi Zhu and Yuan Meat. Gui Yuan belongs to the aril of Longan, a plant of the Sapindaceae family. In China, it is mainly produced in Fujian, Guangdong, Guangxi, Sichuan and other places, in addition to Yunnan and southern Guizhou. South called "gui yuan", the north called "longan", because gui yuan round black luster, the umbilicus protruding white, looks like the legend of "dragon" eyes, so named "Longan". Second: Litchi: /7LsWdDW5_xN3otqbppnN2DJv/fengj/pic/item/e8dc04f472e732fb7609d7b9.jpg Litchi also has a lot of aliases, such as: Dan Lai, Lizhi, Xiangguo, Leli, Li Zhi. Litchi also belongs to the fruit of plants in the Sapindaceae family. Native to the south of China, to Guangdong, Guangxi, Fujian, Sichuan, Yunnan and other places most cultivated.