24 



Cultivated chiefly for fruit. 

 B. Color of fruit red. 



C. Stems slender, trailing ; leaves evergreen. 



D. Apex of leaves acute Oxycoccus 



DD. Apex of leaves obtuse or refuse. 



macrocarpon 

 CC. Stems stouter though creeping ; branches erect, 



tufted Vitis-Idaea 



CCC. Stems erect, much taller (2-10 feet). 

 D. Leaves small (J^-% inch long). 



parviJoUum 

 BB. Color of fruit blue or black. 



C. Plant low, )4-3 feet high. 



D. Foliage evergreen. 



E. Leaves smalI(iC-5^ inch long) . 



nitidum 

 EE. Leaves larger (K-1 inch long). 



Myrsinites 

 DD. Foliage deciduous. 



E. Surface of leaves glabrous. 



F. Leaves pale beneath, not 

 shining above .... vacillans 

 vax. pallidum of corymhosum. 

 FF. Leaves not paler beneath (ex- 

 cept sometimes in Pennsyl- 

 vanicum) ; shining, at least 

 above. 

 GJ-. Flowers solitary in the 

 axils. 

 H. Branches sharply 

 angled. 



Myrtillus 

 HH. Branches not 

 angled. 



ccespitosum 



GG. Flowers in fascicles or 



short racemes. 



H. Fruit blue, glaucous 



Pennsylvanicum, 



HH. Fruit black, 



nigrum 



