VARIABLE PONDWEED 

 (Potamogeton gramineus ; formerly heterophyllus) 



Alaska to Greenland, California, Iowa and 

 Maryland. 



Leaves are often much longer than in the 

 plant pictured. Usually there are floating 

 leaves (see page 6). 



Resembles Illinois Pondweed but has 

 smaller leaves that are always stalkless, and 

 usually is more branched. Long-leaved plants 

 resemble Red Pondweed but are more branched. 



ILLINOIS PONDWEED 

 (Potamogeton illinoensis; includes 

 angustif olius and lucens) 



Southern Canada to southern 

 U. S. 



Underwater leaves are some- 

 times slightly arched lengthwise 

 and are sometimes puckered. 

 Usually there are floating leaves 

 (see page 6). 



Resembles Variable Pondweed 

 but has larger underwater leaves 

 which are often short-stalked. 

 Resembles Bigleaf Pondweed but has 

 underwater leaves that are never 

 more than slightly arched. 



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