BULLETIN OF TIIE UNITED STATES FISH CO&IMISSION. 23 



HALOEAGEiE. 



Water Milfoil family. 



Myriophyllum. — Water-Milfoil. 



Six species are found in the Northern United States, of which M. 

 spicalum is the most common, and occurs sparingly near Washing- 

 ton. 

 Hippuris vulgaris, L. — Mare's Tail. 



New York to Kentucky and northward; rare in the United States; 

 more common in Europe. 



ONAGEACE^E. 



Evening Primrose family. 



Trapa natans, L. 

 Europe, Siberia. 



UMBELLIFEE^E. 

 Parsley family. 



Oenanthe sarmmtosa, Presl. (Pliellandrium aquaticum, L.). 

 Oregon and Washington Territory. 



PEIMULAOE^l. 



Primrose family. 



Rottonia injlata, Ell. (H. palustris, Pursh.). — Featherfoil. 

 Massachusetts to Louisiana. 



LENTIBULABIACE^E. 



Bladderwort family. 



Utricularia vulgaris, L. — Bladderwort. 

 Throughout the North and West 



POLYGONACE^. 



Buckwheat family. 



Polygonum (amphibium, LJ). — Water Persicaria. 



Common. Has been sparingly found near Georgetown, D. C. 



CEEATOPHYLLAOE^]. 



Hornwort family. 



Ceratophyllum demersum, L. — ELornwort. 

 Abundant. 



