54 



Plate 7.— Classification: system Estuarine, SUBSYSTEM Subtidal, class Aquatic Bed, SUBCLASS Submergent Vascular, water 

 regime Subtidal, water chemistry Oligohaline, SOIL Mineral. The dominant plant is water milfoil {Myriophyllum exal- 

 bescens) and the most common subordinates are pondweeds {Potamogeton spp.). (Nansemond County, Virginia; July 1973) 



