ENDOGENS. 



CII. HYDR0CHAEIDACEJ5. Frog's-Bit Familt. 

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



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



Udora Canadensis, Nutt. Gen. II., 242. 



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



AnacJiaris Canadengis, Planchon. Gray, Man. Ed. V. 495. Macoun, 



Cat., No. 1756. 

 SerpiciUa occidentalis, Pureh. Fl. I., 33. 



Very abundant in still waters of rivers, and in lalces 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 River, 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, Cat.) Near Prince's Lodge, 

 Halifax. (Law&on.) In a small lake near North Sydney, Cape Breton 

 Island. {Macoun.) St. Lawrence River, near Point St. Charles, Mon- 

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

 St. Lawrence, and evevj'where common in streams inland and north- 

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