BIGLEAF PONDWEED 

 (Potamogeton amplifolius) 



British Columbia to 

 Montana and California; and 

 North Dakota to Newfound- 

 land, Oklahoma and Georgia. 



Underwater leaves are 

 strongly arched lengthwise. 

 Usually there are floating 

 leaves (see page 7). 



Resembles Illinois 

 Pondweed but Bigleaf Pond- 

 weed's underwater leaves 

 are much more strongly 

 arched and are always 

 stalked. 



RED PONDWEED 

 (Potamogeton alpinus) 



Alaska to Greenland, Califor- 

 nia, Michigan and Pennsylvania, 

 often in streams. 



Plants are usually reddish. 

 Sometimes there are floating 

 leaves (see page 9). 



Resembles Variable Pondweed 

 but is less branched and usually 

 has longer leaves. 



17 



