Ugly orange, whose scientific name is "I don't know fire", is also called "convex orange", "ugly orange", "ugly monster" and "ugly orange". It was bred in the experimental field of horticulture in Japan's Ministry of Agriculture and Water Resources by crossing with Nakano 3 Ponkan 1972. Sichuan planting 1 was introduced for the first time in 2000. In 2003, the unknown fire in Sichuan achieved more than 5 kg of fruit per plant, with the highest 15 kg. Chongqing, Yunnan, Jiangxi, Hunan, Zhejiang and other places are also planted locally. After grafting with high grafting technology, the fruit of Huhuoza is larger in the western Sichuan basin, with an average single fruit weight of 200 grams and a maximum of more than 400 grams. Fruit obovate, mostly with prominent short neck; The pericarp is yellow-orange, and it begins to be colored in the first ten days of 10, and it is completely colored in the first ten days of 12. The peel is yellow and orange, the fruit surface is slightly thick and easy to peel. The sugar content of fruit juice is above 13%, and the highest is 17%, which is very sweet. Mature in February and March of the following year, with excellent flavor.