2. Ponkan is divided into hard rut and rut. Hard rut is also called gossip rut because there are several radial grooves on the top of the fruit, and the fruit is flat and round or high flat round; there are rut, the top of the fruit is generally no radial grooves, and the fruit is flat and round, and the weight of the single fruit and the flavor of the fruit is not as good as hard rut.