97 



CLASS II. 



MONYCOTYLEDONES OR ENDOGENOUS 

 FLOWERING PLANTS. 



SUB-CLASS I. PETALOIDE^E. 

 ORDER LXXXVIII. HYDROCHAEIDACE^E. (FROGBIT TRIBE.) 



ANACHARIS. (Anacharis.) 



I. A. Alsinastrum.* Bab. (Common Anacharis, or 

 Pondweed.) Elodea Canadensis (Mich.*) 



Ponds, ditches, canals, and streams. 7-10. 



Canal at Greenford. Abundant. Ruislip Reservoir, 

 pond near Stanmore. This American species first made 

 its appearance some years ago, we believe about the year 

 1849, but is now alarmingly increasing year by year, 

 and too generally diffused to be eradicated. There are 

 huge beds of it in the Canal, which yearly increase in size. 



HYDROCHARIS. (FrogUt.) 



i. H. Morsus-ranse. L. (Common Frogbit.) 

 Ditches and ponds. 7, 8. 

 Pond at Forty Farm ; Wembley Park. (Cole.) 



