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Plate 72.— Classification: system Palustrine, CLASS Emergent Wetland, SUBCLASS Nonpersistent, dominance type Hippuris 

 tetraphylla, water regime Permanently Flooded, water chemistry Fresh. A semipermanently flooded persistent-emergent 

 wetland dominated by sedge (Carex lyngbyei) surrounds the Hippuris marsh. Burreed (Sparganium hyperboreum) grows in shallow 

 water between the Hippuris and the sedges. (Narokachik River area, Yukon-Kuskokwim Delta, Alaska; July 1985; Photo by 

 F. C. Golet) 



