296 ERICACEAE. 



3. Leaves very small (10 mm.), re volute. (2). V. Oxycoccos. 

 Leaves larger (15 mm.). V. macrocarpon. 



4. Low evergreens with small leaves. 5. 

 Deciduous. 8. 



5. Leaves blunt-mucronate, notched, dotted. 



(3). V. Vitis-Idaea. 

 Leaves acute: twigs puberulent and often granular. 6. 



6. Leaves prevailingly oblanceolate and acute. 7. 



Leaves obovate and acuminate. (4). V. nitidum. 



7. Leaves green on both sides. (5). V. Myrsinites. 

 Leaves glaucous beneath. V. Myrsinites glaucum. 



8. Buds oblong, appressed, with 2 obtuse exposed scales. 9. 

 Buds ovoid or subglobose: scales several, or pointed. 15. 



9. Twigs without angles. 10. 

 Twigs conspicuously angled. 12. 



10. Bark finely shredding: twiggy and low. V. uliginosum. 

 Bark scarcely shredding. 11. 



11. Scarcely a span high: tufted: -slender. (6). V. caespitosum. 

 Taller and stouter. V. erythrocarpum. 



12. Dwarf and tufted, scarcely over a span high. 13. 

 Taller and more bushy. 14. 



13. Twigs slender: buds 1-1.5 mm. (7). V. erythrococcum. 

 Twigs stouter: buds often 2 mm. long. V. oreophilum. 



14. Twigs almost winged. V. parvifolium. 

 Twigs only ribbed. V. ovalifolium. 



15. Buds ovoid or oblong, ascending or appressed. 16. 

 Buds subglobose or round-ovoid, divergent. 19. 



16. Low shrubs. 17. 



Tall: twigs angled and warty. (8). V. corymbosuni. 



17. Twigs grooved above the buds, or angular. 18. 



Twigs nearly terete, very hairy. (9). V. canadense. 



18. Twigs nearly smooth. V. pennsylvanicum. 

 Twigs distinctly granular-warty. V. vacillans. 



19. Moderate or low shrub. (10). V. stamineum. 

 Large shrub or small tree, often twiggy. V. arboreum. 



