1920.1 



NATURAL SCIENCES OF PHILADELPHIA. 



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Table 2. 

 Acidity Relations of Ericaceae Studies 



Medi- Sub- 

 acid acid 



300 100 30 

 Clethreae. 



Clethra alnifolia ' X x x 



Pyroleae 



Pyrola americana x x X 



elliptica o X 



secunda x X 



Chimaphila maculata x x X 



umbellata x x X 



MONOTROPOIDEAE 



Monotropa uniflora x X 



Hypopitys lanuginosa . X 



americana . X 



Ekicoideae (Ericaceae) 



Azalea nudiflora x x X 



canescens x x X 



arborescens . X 



viscosa '.... X x x 



Rhododendron maximum X X X 



Menziesia pilosa x x X 



Deridrium buxifolium X x 



Kalmia latifolia X X X 



angustifolia X X X 



Eubotrys racemosa X X X 



Neopieris mariana X x x 



Xolisma ligustrina X X X 



Chamaedaphne calyculata X x X 



Oxydendrum arboreum x x X 



Epigaea repens X X X 



Gaultheria procumbens X X X 



Arctostaphylos uva-ursi X X X 



Vaccinioideae (Vacciniaceae) 



Chiogenes hispidula X x x 



Gaylussacia brachycera X x x 



dumosa X 



frondosa X x x 



baccata x X X 



Vaccinium stamineum x ' X 



pennsylvanicum X X X 



vacillans X X X 



corymbosum X X X 



atrococcum x X X 



erythrocarpum X X X 



Oxycoccos X 



macrocarpon X x x 



Diapensiaceae 



Pyxidanthera barbulata X x x 



Galax aphylla X x x 



Empetraceae 



Corema eonradii X x 



Minim- Neutral 

 acid 



10 



1 



X 



X 



n 



X 

 X 



o 



X 



o 



o 



