95 



Plate 50.-Classification: SYSTEM Palustrine, CLASS Unconsolidated Bottom, SUBCLASS Sand, water REGIME Intermittently Ex- 

 posed, water chemistry Fresh-Alkaline. Rushes (Juncus spp.), spike rush (Ekocharis sp.), and smartweed (Polygonum sp.) grow 

 in shallow water along the shore of this 0.4-ha (1-acre) pond which occupies a depression amidst sand dunes on the southern shore 

 of Lake Michigan. (Indiana Dunes National Lakeshore, Porter County, Indiana; May 1985; Photo by F. C. Golet) 



