80 



POTAMOGETONACEAE 



Potamogeton 



50 



Map 83 

 Potamogeton angustifolius 

 Berch.&Pres! 



50 



Map 86 



Potamogeton lucens L. 



~^0 



Map 84 



Potamogeton i 1 1 i noensi s Morong 



50 



Map 87 



Potamogeton praelongus Wulfer 



~^0 



Map 85 



Potamogeton crispus L. 



Potamogeton Richardsonn 

 (Bennett) Rydb. 



Miles 

 0"^ "S3 



Map 88 



10. Potamogeton crispus L. Map 85. I have found this species in 

 both Cedar Lake and Wolf Lake in Lake County. It was reported from 

 Wolf Lake as early as 1913. In 1937 I found a few plants in shallow water 

 on the south side of Lake Cicott, Cass County. Doubtless it is not common 

 in this lake because a few years ago I spent a half day in a boat in search 

 for pondweeds in this small lake and I did not find it. 



Nat. of Eu. ; Mass. to Ont., southw. to Va. and Mo. 



11. Potamogeton lucens L. Map 86. Infrequent in our lakes. It is 

 difficult to distinguish this species from Potamogeton angustifolius if float- 

 ing leaves and fruits are not present. 



N. S. to Calif., southw. to Fla. and Mex. ; also found in W. I., Eurasia, 

 and Africa. 



12. Potamogeton praelongus Wulfen. Map 87. Infrequent in the lakes 

 of the lake area. 



Newf. to B. C, southw. to Conn., N. J., Ind., Iowa, Mont., and Calif. 



