362 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



Plants of Dry Woods 



Reaction 



Plants of Open Fields 



Thymus Serpyllwm 

 it tt 



H H 



Pycnanthemum flexuosum 



3 + alk. 

 neutral 

 3 + acid 

 3 + alk. 



Solidago macrophylla 

 Trillium erectum 

 Epigaea repens 

 Potentilla tridentata 



Plants of Ill-drained Woods 



(alt. 2700 ft.) 

 (alt. 2500 ft.) 



(alt. 2300 ft.) 



Plants of Sandy Fields 



Lechea intermedia 



Carex festucacea, var. minor 



100 + acid 



100 + acid 



3 + acid 



3 + acid 



3 + acid 

 neutral 



