296 
18. 
19. 
ERICACEAE. 
. Leaves very small (10 mm.), revolute. (2). V. Oxycoccos. 
Leaves larger (15 mm.). V. macrocarpon. 
. Low evergreens with small leaves. 5. 
Deciduous. §8. 
. Leaves blunt-mucronate, notched, dotted. 
(3). V. Vitis-Idaea. 
Leaves acute: twigs puberulent and often granular. 6. 
. Leaves prevailingly oblanceolate and acute. 7. 
Leaves obovate and acuminate. (4). V. nitidum. 
. Leaves green on both sides. (5). V. Myrsinites. 
Leaves glaucous beneath. V. Myrsinites glaucum. 
. Buds oblong, appressed, with 2 obtuse exposed scales. 9. 
Buds ovoid or subglobose: scales several, or pointed. 15. 
. Twigs without angles. 10. 
Twigs conspicuously angled. 12. 
. Bark finely shredding: twiggy and low. V. uliginosum. 
Bark scarcely shredding. 11. 
. Searcely a span high: tufted: slender. (6). V. caespitosum. 
Taller and stouter. V. erythrocarpum. 
. Dwarf and tufted, scarcely over a span men. 13, 
Taller and more bushy. 14. 
. Twigs slender: buds 1-1.5 mm. (7). V. erythrococcum. 
Twigs stouter: buds often 2 mm. long. V. oreophilum. 
. Twigs almost winged. V. parvifolium. 
Twigs only ribbed. V. ovalifolium. 
. Buds ovoid or oblong, ascending or appressed. 16. 
Buds subglobose or round-ovoid, divergent. 19. 
. Low shrubs. 17. 
Tall: twigs angled and warty. (8). V. corymbosum. 
. Twigs grooved above the buds, or angular. 18. 
Twigs nearly terete, very hairy. (9). V. canadense. 
Twigs nearly smooth. V. pennsylvanicum. 
Twigs distinctly granular-warty. V. vacillans. 
Moderate or low shrub. (10). V. stamineum. 
Large shrub or small tree, often twiggy. V. arboreum. 
