Potamogeton pusillus subsp. pusillus
Family: Potamogetonaceae
broad-leaved small pondweed, slender pondweed, small pondweed
Potamogeton pusillus subsp. pusillus image
from USDA Plants website  
Potamogeton pusillus subsp. pusillus image
University of Wisconsin-Stevens Point, Robert W. Freckmann Herbarium (UWSP)  
Description Not Yet Available