Considering the difference of the shape change of their floral primordium apex etc, Euryale should be more evolutional than Nymphaea, and it shoud be an evolutional group in Nymphaeaceae.4.

• 根据睡莲属与芡属花器官发生过程中花原基顶端的形态变化等特点，认为在系统发育上，芡属要比睡莲属进化，芡属应是睡莲科中较为进化的类群。