xx TREES 



112. Leaflets coarsely toothed and lobed. p. 95.Koelreuteria. 

 Leaflets only toothed. 113. 



Leaflets entire. (Maackia). p. 71. Cladrastis. 



113. Buds very small: leaves abruptly pinnate, p. 69. Gleditsia. 

 Buds rather large: leaves odd-pinnate. p. 57. Sorbus. 



114. Twigs stout: pith large. 115. 

 Twigs and pith smaller. 116. 



115. Leaflets nearly entire: pith colored. p. 69. Gymnocladus. 

 Leaflets distinctly toothed. p. 81. Melia. 



116. Leaflets nearly entire. p. 69. Gleditsia. 

 Leaflets coarsely toothed. p. 95. Koelreuteria. 



Leaves opposite. 



117. Leaves simple. 118. 



Leaves pinnately compound. 126. 



Leaves palmately compound. p. 93. Aesculus. 



118. .Leaves regularly palmately lobed. p. 90. Acer. 

 Leaves not uniformly lobed. 119. 



119. Leaves very large, cordate. p. 137. Paulownia. 

 Leaves not very large. 120. 



120. Leaves cordate: twigs rosy. p. 36. Cercidiphyllum. 

 Leaves not cordate. 121. 



121. Leaves all in opposite pairs: sap not milky. 122. 

 Leaf-pairs often broken or aromatic or sap milky. 123. 



122. Leaf-scars small and narrow. p. 109. Cornus. 

 Leaf-scars larger: buds superposed. p. 127. Fraxinus. 



123. Twigs 4-winged: flowers showy. p. 108. Lagerstroemia. 

 Twigs not winged: flowers small. 124. 



124. Sap milky: very hairy. p. 30. Broussonetia. 

 Sap not milky. 125. 



125. Not aromatic: flowers in catkins. p. 19. Salix. 

 Aromatic, like camphor or cinnamon, p. 45. Cinnamomum. 



126. Pith large: fruit a small berry. p. 141. Sambucus. 

 Pith moderate. 127. 



127. Leaflets often coarsely toothed or lobed. p. 90. Acer. 

 Leaflets at most finely toothed. 128. 



128. Leaf-scar nearly encircling bud. p. 78. Phellodendron. 

 Leaf-scars not encircling the buds. p. 127. Fraxinus. 



