68 





Mi 





Plate 23.-Classification: system Estuarine, subsystem Intertidal, class Emergent Wetland, subclass Nonpersistent, dominance 

 type Hippuris tetraphylla, water regime Regularly Flooded, water chemistry Mixohaline, soil Mineral. This stand of mare's 

 tail lies at the landward limit of the regularly flooded zone, where the substrate is covered with several centimeters of water 

 at high tide. The Azun River, source of the tidal water, is just visible at the right-hand edge of the photo. (Mouth of Azun River, 

 Yukon-Kuskokwim Delta, Alaska; July 1985; Photo by F. C. Golet) 



