The Wu shi (Diospyros cathayensis) belongs to the Ebenaceae (the Ebony family). It is a tall evergreen tree that is native to central-south China. This tree grows in forests in ravines at an altitude of 600-1500 m, and can reach about 10 m in height. It is sometimes cultivated. The leaves are elliptic, thinly leathery, and dark green. The white to pale yellow flowers with 4 calyx lobes bloom April and May. The fruits are orange, globose to ovoid, and ripen from August to October. The fleshes of fruits are sweet and edible.