12 



Figure 5 

 Vallisneria americana: A. habit of staminate plant, x 

 '/». B. habit of pistillate plant, x '/t. C. staminate 

 spathe, X 1. D. staminate flower, x 6. E. pistillate 

 flower, X l.F. fruit, X '/i.G. portion of leaf showing la- 

 cunae bands, x 1. 



