Abstract: The course of the feminization of the male flower of this plant is a common phenomenon in Kianwan district of Shanghai. The plant with feminized flowers shows no changes in the morphological characteristics of the vegetative organs. The main character is that the five stamens have been displaced by five pistils. A new form of flower with six pistils has been found. The plant with fiminized flowers may develop in groups by vegetative multiplication. Its newly-formed character is permanent. Complete fiminization is seen at various places in Kianwan district. However, it possesses the morphology of various degrees of transition.