BIGSHEATH PONDWEED 

 (Potamogeton vaginatus) 



Alberta to Quebec, Colorado, Wisconsin and New York. 



Resembles Sago and Threadleaf Pondweeds but usually has 

 longer leaves; the bases of the main-stem leaves make a sheath 

 that is two or more times as wide as the stem; and the stalks of 

 the seed heads are usually shorter than the surrounding leaves. 

 It also differs from Sago Pondweed in having seeds with a 

 flattish, wartlike tip; from Threadleaf Pondweed in the seed 

 heads usually having 6 to 10 clusters of seeds. 



28 



