Potaiiiogeton heterophyllus, Schreb. Various-leaved 

 Pondweed. 



In ponds and lakes from the Missouri river eastward. 



Potaiiiogetoii perfoliatus Richardsonii, A. Bennet. 

 Clasping-leaved Potamogeton. 



Common in the Minnesota and Sioux Valleys. 



Potamogeton alpiiius, Balbis. Northern Pondweed. 

 In the Sioux river near Brookings. 



Potamogeton foliosus, Raf. I^eafy Pondweed. 

 In ponds and streams throughout the state. 



Potamogeton foliosns niagarensis,(Tuckerm.)Morong. 

 In the Sioux Valley. 



Potamogeton zosteraefolius, Schum. Ell-grass Pond- 

 weed. 



In the Sioux and James valleys. 



Potamogeton Hillii, Morong. Hill's Pondweed. 

 In the Sioux valley. 



Potamogeton pnsillus, L. Small Pondweed. 



Common in ponds from the Missouri valley eastward. 



Potamogeton pectinatus, L. Fennel-leaved Pond- 

 weed. 



In lakes and streams throughout the state. 



Potamogeton marinus occidentalis, Robbins. The 

 Western Pondweed. 

 In the Black Hills. 



Potamogatoii palnstris, L. Swamp Patamogeton. 

 In shallow water in the Sioux Valley. 



Zanieliellia palnstris, L,. Zanichellia. 



In brackish or fresh water ponds throughout the state. 



Kuppia oecideutalis, S. Wat, Western Ruppia. 



In a strongly alkaline pond in the Minnesota valley, 

 near Gary. 

 Naias flexilis, ( Willd.) Rost & Schmidt. Slender Naias. 



In pounds and lakes throughout the state. 



