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Urtica, Tourn. 



dioica, L. (Slinging Nettle. 



Canadensis, L. 

 PiLEA, Lindl. 



pumila, Lindl. 

 BcEHMERiA, Jacq. 



cylindrica, Willd. 

 Parietaria, Tourn. 



Pennsylvanica, Muhl. 



Class II.— ENDOGENiE. 



Order 90.— ARACE^E. 



Arum, L. 



triphyllum, L. (Indian Turnip.) 



Draconiium, L. (Dragon Root.) 

 Symplocarpus, Salish. 



foetidus, Salisb. (Skunk Cabbage.) 

 Acorus, L. 



Calamus, L. (Sweet Flag.) 



Order 91.— LEMNACE^. (Duckweed Family.) 



Lemna, L. 



minor, L. (Duck-weed.) 

 polyrhiza, L. 



Order 92.— TYPHACEiE. (Cat-tail Family.) 



Typha, Tourn. 



latifolia, Z. (Cat-tail.) 

 Sparganium, Tourn. 



ramosum, Hudson. (Burr-reed.) 



Americanum, Nutt. 



