Sweet orange is a citrus tree in the Rutaceae family, with few or no thorns on its branches; The flowers are white, with fewer flowers having a light purple red color on the back; The fruit is round, flattened, or elliptical in shape, ranging from orange yellow to orange red; The leaves are oval or ovoid in shape; The skin is generally difficult to peel off, and the flesh is light yellow, orange red, or purple red, with a sweet or slightly sour taste; The flowering period is from March to May; The fruiting period is from October to December, and the fruiting period of late maturing varieties is from February to April of the following year. In "Pulse of Macau", it is mentioned that the origin of the name "Sweet Orange" comes from the abbreviation of "Old Tree Sweet Orange", which evolved into "Sweet Orange" after being passed down orally.