102 



Plate 57.— Classification: system Palustrine, CLASS Emergent Wetland, SUBCLASS Persistent, dominance type Typha latifolia, 

 water regime Permanently Flooded, water chemistry Fresh, special modifier Impounded. Persistent emergents such as 

 these cattails remain standing at least until the beginning of the next growing season. Note that the adjacent lake is ice-covered 

 at the time of photography. (Knox County, Maine; April 1978; Photo by P. B. Reed) 



