SLENDER PONDWEED 

 (Potamogeton pusillus; includes 

 berchtoldi, gemmiparus and lateralis) 



Fresh and alkali water inland 

 from Alaska to Greenland, California, 

 Texas and Georgia; and fresh and 

 slightly brackish water along each 

 coast. 



Resembles Leafy, Fries, Vasey, 

 Snailseed, Hill and Bluntleaf Pond- 

 weeds. It has longer-stalked seed 

 heads than Leafy Pondweed, and its 

 seeds have blunt backs. It has 

 smaller seeds than Fries Pondweed 

 (a little more than 1/16 inch vs. a 

 little less than 1/8 inch); smaller, 

 tighter, smooth-leaved winterbuds; 

 and usually smaller leaves with 3 

 veins. It has bigger, fatter 

 winterbuds than Vasey Pondweed. It 

 has longer-stalked seed heads than 

 Snailseed Pondweed; convex-sided 

 seeds; and leaves with bases that do 

 not make a sheath around the stem. 

 It has longer-stalked seed heads and 

 smaller seeds than Hill and Blunt- 

 leaf Pondweeds; seeds with blunt 

 backs; and usually smaller leaves. 



FRIES PONDWEED 

 (Potamogeton friesii; includes longiligulatus and strictif olius) 



Northwest Territories to Newfoundland, Utah, Indiana and Virginia. 



Looks like extra big Slender Pondweed but has larger seeds (a 

 little less than 1/8 inch vs. a little more than 1/16 inch); larger, 

 looser winterbuds that are corrugated at the base with raised veins; 

 and usually larger leaves with 5 or 7 veins. 



Resembles Hill, Bluntleaf and Leafy Pondweeds. It has longer- 

 stalked, looser seed heads than Hill and Bluntleaf Pondweeds, and its 

 seeds have blunt backs. It has longer-stalked, looser seed heads than 

 Leafy Pondweed; seeds with blunt backs; and usually larger leaves. 



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