BLUNTLEAF PONDWEED 

 (Potamogeton obtusif olius) 



British Columbia to Saskatchewan and 

 Wyoming; and Minnesota to Quebec, Michigan 

 and New Jersey; often in slow streams. 



Resembles Hill, Leafy, Fries and 

 Slender Pondweeds. It has longer seed heads 

 with more seeds than Hill and Leafy Pond- 

 weeds; blunt-tipped leaves in contrast with 

 Hill Pondweed's sharp-tipped ones; and 

 larger seeds and usually larger leaves than 

 Leafy Pondweed. It has shorter-stalked seed 

 heads than Fries and Slender Pondweeds; and 

 the larger seeds have sharply ridged backs. 

 It usually has flimsier leaves than Fries 

 Pondweed, usually larger ones than Slender 

 Pondweed. 



FLATSTEM PONDWEED 

 (Potamogeton 



zosterif ormis) 



Alaska to New 

 Brunswick, Cali- 

 fornia, Nebraska 

 and Virginia. 



Stems are 

 several times 

 wider than thick. 



Resembles 

 Water- stargrass 

 but has leaves 

 with a prominent 

 midvein and with 

 a base that does 

 not make a sheath 

 around the stem; 

 and has pondweed- 

 type flower and 

 seed heads. 



24 



