II. Monocotyledons'] LXXVIII. NAIADES,. 



241 



964. Potamogeton densus, L. 



Opposite Pondweed. 



965. Potamogeton obtusifolius, 

 M.&K. 



Ohtuse Pondiveed. 



966. Potamogeton acutifolius, L. 

 Acute Pondiveed. 



967. Potamogeton pusillus, L, 



Slender Pondiveed^ 

 R 



