118 





Plate 73.— Classification: system Palustrine, CLASS Emergent Wetland, subclass Nonpersistent, dominance type Nuphar luteum, 

 water REGIME Semipermanently Flooded, water chemistry Fresh. The principal subordinate plant is common duckweed (Lemna 

 minor). (Cass County, Michigan; May 1985; Photo by F. C. Golet) 



