KEY TO GENERA 17 



15. Leaves opposite. . . Lonicera, p. 187 



15. Leaves alternate. 16 



16. Climbing plants. 17 



16. Not climbing. 18 



17. Climbing by tendrils. . . Smilax, p. 45 



17. Climbing by aerial roots. . . Hedera, p. 158 



18. Stems creeping or low (under 20 cm. high). 23 



18. Stems much taller. 19 



19. Fruit an acorn. . . Quercus, p. 74 



19. Fruit not an acorn. 20 



20. Stipule-scars encircling the twig. . .Magnolia, p. 94 



20. Not as above. 21 



21. Leaves very rusty -woolly beneath. . . Ledum, p. 163 



21. Not as above. 22 



22. Leaves scurfy- pubescent beneath. . . Chamaedaphne , p. 171 



22. Not as above. 24 



23. Stems red-bristly; fruit dry. . . Epigaea , p. 171 



23. Stems glabrate; fruit fleshy, red. . .Gaultheria, p. 173 



24. Leaves whitened beneath. . . Andromeda, p. 169 



24. Leaves not conspicuously whitened beneath. 25 



25. Leaves entire. 26 



25. Leaves not entire. 29 



26. Fruits persistent, in several-flowered racemes. . . Pieris , p. 169 



26. Not as above. 27 



27. Leaves 3 cm. or less long. . . Arctostaphylos, p. 173 



27. Leaves more than 3 cm. long, 28 



28. Buds moderate or large, scales several. . . Rhododendron, p. 163 



28. Buds minute, scales 2 or none.. . Kalmia, p. 167 



29. Leaves armed with spiny teeth. .\ Ilex, p. 134 



29. Leaves minutely serrulate. 30 



30. Leaves less than 3 cm. long. . . Gaylussacia, p. 175 



30. Leaves up to 15 cm. long. . . Leucothoe , p. 170 



FOLIAGE DECIDUOUS 



31. Leaf-and stipule-scars lacking, the buds subtended by 

 minute scales. . . Taxodium , p. 41 



31. Not as above. 32 



