According to the structure of lotus, although it belongs to Shuang Ye, it has the morphological characteristics of monocotyledonous plants in ancient plants. Usually, the cotyledons of dicotyledonous seedlings are opposite and rarely alternate, while the two cotyledons in lotus seeds are alternately arranged and the stems are connate. The vascular bundles in the stems of dicotyledonous plants are arranged in a ring shape, while lotus plants are scattered like monocotyledonous plants. Except for one vein returning to the leaf clip, the other lotus veins are bifurcated, which is another primitive trait. Moreover, lotus seedlings also have erect stems and underdeveloped taproots, which is a morphological change that plants have lived on land in order to adapt to the aquatic environment. At the same time, the lotus of aquatic plants maintains the "requirement" of aerial pollination of terrestrial higher plants. This proves that the ancestors of lotus once lived on land. Later, in order to meet the needs of aquatic environment, some organs were greatly simplified or degraded (such as the degradation of roots). In a word, the original characters maintained by lotus have high research value in plant evolution system. Someone once compared it with Metasequoia glyptostroboides, calling it "the two wonders of China".