SPERMATOPHYTA— ANGIOSPERMS— HELOBIAE 333 



Fig. 131. Pond-weed (Polamogeton natans). 1. 

 Apex of flowering shoot. 2. Flower viewed from 

 above. 3. Flower viewed from side. 4. Diagram 

 of flower. (After Wossidlo). 



Fi?. 132. Vond ■weed (fioiamogeton). Common in fresh water 

 po nds . 



