26 



SHRUBS. 



108. Buds crowded above, with several scales. Quercus. 

 Buds not crowded above, with 2 exposed scales. Castanea. 



109. Leaves, at least on some shoots, 2-ranked. no. 

 Leaves in more than 2 ranks. 115. 



no. Twigs often bristly: fruit a nut in a husk. Corylus. 



Twigs not bristly, in. 

 in. Pith 3-sided, small: flowers in catkins. Betula. 



Pith not 3-sided. 112. 



112. Buds short. 



Fruit fleshy : twigs not green. Photinia. 



Fruit dry. 113. 

 Buds elongated (5 mm.) : fruit berry-like. Amelanchier. 



113. Twigs bright green: leaves sharply toothed. Kerria. 

 Twigs duller. 114. 



114. Leaves entire below, crenate above. Fothergilla. 

 Leaves crenate throughout. Hamamelis. 



115. Twigs rather coarse: not stellate-pubescent. Coryius. 

 Twigs slender. 116. 



116. Stellate-roughened: buds superposed. Styrax. 

 Without stellate hairs: buds solitary. 117. 



117. With nectar-glands on petiole or leaf -base. Prunus. 

 Without nectar-glands. 118. 



118. Pith chambered. 119. 

 Pith continuous. 120. 



119. Leaves thin and flat. Halesta. 

 Leaves firm, revolute. Symplocos. 



120. Leaves appearing entire except under the lens. 121. 

 Leaves distinctly, if finely, crenate or toothed. 123. 



121. Buds pressed in grooves in the stem. Lyonia. 

 Buds not in grooves. 122. 



122. Branches long and slender. Spiraea. 

 Branches not wand-like. Leucothoe. 



123. Leaves with dark glands on the midrib above. Aronia. 

 Leaves without such glands. 124. 



124. Bud-scale solitary: flowers in catkins. Salix. 

 Bud-scales several. 125. 



