The scientific name of the spring citrus is spring see, commonly known as ponkan: the citrus of the genus Citrus, from the fruit tree test site in Shizuoka, Japan, the Fruit Research Institute of the Fujian Academy of Agricultural Sciences, the Sanming City Economic Crop Technology Extension Station, Qingming Orange Orange/F-2432 ponkan, introduced from the China Citrus Research Institute in 2001, widely planted in Pengshan County, Pujiang County, Danling County, Renshou County, Jintang County, Jiangxi, Hunan, Fujian Sanming, Nanping, Longyan, Fuzhou, etc. The mature period is from December to January.

Seasonal characteristics: The ripening period of spring citrus is a rare winter orange in the winter season, while the traditional orange is the autumn ripe orange, the ripe orange and the ugly orange in the spring orange ("spicy") March. Quality characteristics: the skin is thin and no abundance, the cortex is soft, so it is commonly called ponkan.

The fruit is high in oblate shape and relatively uniform in size. The peel is orange-yellow, the fruit surface is smooth, shiny, and the oil cells are fine and easy to peel. The flesh is orange, the meat is crispy, juicy, the wall of the capsule is thin, the slag is polarized, the sugar content is high, the flavor is rich, the sweet and sour taste is good, the core is not good, and the quality is excellent. Tested by Agricultural Products Quality and Safety Inspection and Testing Center of Sanming City, Fujian Province: single fruit weight 242 grams, longitudinal diameter 7.07 cm, transverse diameter 7.69 cm, peel thickness 0.31 cm; soluble solids 14.5%, edible rate 76.64%, vitamin C30.5 mg /100 g. According to the field investigation of the plant protection station of Sanming City, the main diseases of this species are scab, anthracnose and maculopathy, and the degree of pests and diseases is similar to that of citrus.