25 



EE. Surface of the leaves hairy. 



F. Ovary and fruit glaucous. 



Canadense 

 FF. Ovary and fruit hirsute. 



hirsutum 

 CC. Plant taller (3—12 feet), spreading. 



D. Flowers solitary in axils. 



E. Leaves sharply serrate . . myrtilloides 

 EE. Leaves entire or slightly serrulate 



ovalifolium, 

 DD. Flowers in racemes or corymbs. 



E. Racemes elongated on naked 



branches virgatum 



EE. Racemes shorter coi-ymbosum 



AA. Cultivated chiefly for ornament. 

 B. Plants low, 1—2 feet high. 



C. Stems creeping, with branches erect or as- 

 cending. 

 D. Leaves small, shining crassifoKum 



DD. Leaves larger, pale or glaucescent. 



uliginosum 



CC. Stems erect ; twigs red erythrinum 



BB. Plants taller, 2-20 feet high. 



C. Foliage evergreen, rigid ovatum 



CC. Foliage deciduous. 



D. Surface shining above, more or less 



pubescent beneath arboreum 



DD. Surface paler above, glaucous beneath. 



stamineum 

 DDD. Surface bright green both sides. 



erythrocarpon 



THE MOST IMPORTANT SPECIES. 



V. Oxycocc«s, L. (Small Cranberry) 

 Linnaeus, Sp. PI. 351, 1753- 



(Synonyms: Oxycoccus palustris, Pers., Syn. PL 1:419; 

 Oxy coccus vulgaris, Pursh. Fl. i : 263.) 



Slender creeping plants with short (4-10 inch) filiform stems, 

 leaves ovate, acute or acuminate, % inch long, with revolute 



