288 CHINESE MATERIA MEDICA. 



NYMPHiEA TETRAGONA.— ^ jf (Shui-lien). This 

 is spoken of in the Ptnt&ao under the article on Nnphar 

 japonicuvi. Its leaves resemble those oi Limttanthemum nymph- 

 oides^ but are larger. Its flowers spread above the leaves, and 

 during the summer open during the day, closing at night and 

 withdrawing beneath the water, to appear with daylight the 

 following morning. It is not distinguished medicinally from 

 Nuphar^ 



