SPARGANIACEAE 



Sparganium americanum Nutt Burreed. 



Wet soil. 

 Sparganium eurycarpum Engelm. 



Wet soil, mostly along river. 



ALISMATACEAE 



Alisma subcordatum Raf Water plantain. 



Margin of ponds and in swampy places. 

 Sagittaria latifolia var. pubescens (Muhl.) J. G. Sm.. .Downy arrowhead. 



Shallow water or muddy soil. 

 Sagittaria latifolia Willd Common arrowhead. 



Margin of river and ponds. 



HYDROCHARITACEAE 



Elodea canadensis Michx Elodea. 



The two ponds near Hickey Run, locations 30 and 32. 



GRAMINEAE 



Agropyron repens (L.) Beauv Quackgrass. 



Common in open ground. 



Agrostis alba L. (A. palustm of the 1919 "Flora of the 



District of Columbia.") Redtop. 



Common in fields. 



Agrostis hiemalis (Walt.) B.S.P Ticklegrass. 



Common in open ground. 



Agrostis perennans (Walt.) Tuckerm Autumn bentgrass. 



Frequent in woods. 



Agrostis tenuis Sibth. (A. capillars of the 1919 "Flora of the 



District of Columbia.") Rhode Island bent. 



Grasslands. 

 Aira caryophyllea L Hairgrass. 



Dry sterile soil in several places, especially on Mount Hamilton and Hickey 

 Hill. 



Andropogon elliottii Chapm Elliott bluestem. 



Occasional in sterile, open ground. 

 Andropogon scoparius Michx Little bluestem. 



Dry fields and open woods. 



