\v /* 



ENDOGENS. 



Oil. HYDROCHARIDACE^E. FROG'S-BIT FAMILY. 

 585. ELODEA, Michx. Fl. I., 20. (WATER-WEED.) 



(2208.) E. Canadense, Planchon. Michx. Fl. I., 20. 



Udora Oanadensis, Nutt. Gen. II., 242. 



U. verticillata, Spreng. Hook. Fl. II., 193. 



Anacharis Canadensis, Planchon. Gray, Man. Ed. V. 495. Macoun, 



Cat., No. 1756. 

 Serpicula ocddentalis, Pursh. Fl. L, 33. 



Very abundant in still waters of rivers, and in lakes and ponds 

 throughout Quebec and Ontario. Although it makes a luxuriant growth 

 in summer, it never chokes Canadian streams, as the frosts of winter 

 destroy it. (Macoun.) Souris Eiver, Assiniboia. (/. M. Macoun.} 

 Canada to the Saskatchewan. {Hooker, Fl.} 



586. VALLISNERIA, Linn. Gen. 1097. (EEL-GRASS.) 



(2209.) V. spiralis, Linn. Hook. Fl., II., 192. 



V. Americana, Michx. Fl. II., 220. Pursh, Fl. II., 602. 



Not uncommon in slow-flowing rivers and shallow borders of lakes. 

 Its range is rather wider than the last, but it is not so plentiful. In 

 shallow water, St. Stephen, N.B. (Fowler, Gat.) Near Prince's Lodge, 

 Halifax. (Lawson.) In a small lake near North Sydney, Cape Breton 

 Island. (Macoun.) St. Lawrence Eiver, near Point St. Charles, Mon- 

 treal, 1821. (Dr. Holmes.) Common at Ottawa. (Fletcher, Fl. Ott.) 

 St. Lawrence, and everywhere common in streams inland and north- 

 1 



