xxxviii UNDER SHRUBS 



Low Bushy Plants. 

 Evergreen Undershrubs. 



17. Leaves distinctly alternate. 18. 



Leaves partly or wholly opposite, or overlapping. 26. 

 Leaves, or many of them, evidently whorled. 32. 



18. Leaves scurfy beneath. p. 119. Chamaedaphne. 

 Leaves not scurfy. 19. 



19. Leaves very narrow or small (scarcely 10 mm. long). 20. 

 Leaves larger. 21. 



20. Leaves not grooved: fruit dry. p. 117. Phyllodoce. 

 Leaves grooved above and beneath. p. 83. Empelrum. 

 Leaves narrowly grooved beneath. p. 83. Corema. 



21. Leaves strongly or closely revolute. 22. 

 Leaves only slightly or openly revolute. 23. 



22. Leaves brown-woolly beneath. p. 115. Ledum. 

 Leaves often whitened. p. 118. Andromeda. 

 Leaves neither woolly nor whitened. p. 120. Epigaea. 



23. Leaves essentially entire. 24. 

 Leaves distinctly serrulate. 25. 



24. Leaves not broadened upwards. p. 117. Kalmia. 

 Leaves broadened upwards. p. 123. Arctostaphylos. 



25. Leaves dotted beneath. p. 123. Vaccinium. 

 Leaves not dotted. p. 122. Gaylussacia. 



26. Small-leaved and moss-like. p. 117. Cassiope. 

 Not moss-like. 27. 



27. Leaves very small, overlapping: heath-like. 28. 

 Leaves larger, not overlapping. 29. 



28. Gray-pubescent. p. 105. Hudsonia. 

 Leaves not canescent, minutely auricled. p. 121. Calluna. 



29. Leaves essentially entire. 30. 



Leaves distinctly toothed, flat. p. 89. Pachistima. 



30. Leaves black-dotted beneath. p. 116. Leiophyllum. 

 Leaves not dotted. p. 117. Loiseleuria. 



31. Leaves rather broad. p. 117. Kalmia. 

 Leaves narrow and small. 32. 



32. Leaf-whorls densely crowded. p. 121. Erica. 

 Leaf-whorls separated. p. 83. Corema. 



