TREES. 17 



94. Buds solitary. Pterocarya. 

 Buds superposed. Juglans. 



95. Buds concealed by a membrane after leaf-fall. Robinia. 

 Buds quickly exposed. 96. 



96. Leaf-scar nearly encircling the bud. 97. 

 Leaf-scar not surrounding the bud. 98. 



97. Leaflets small (2X4 cm.). Sophora. 

 Leaflets large (often 5 X 10 cm.). Cladrastis. 



98. Leaf -scars large, shield-shaped: buds superposed. 99. 

 Leaf-scars narrow or small. 100. 



99. End-bud present : buds ovoid. Carya. 

 End-bud deciduous : buds half-round. Sapindus. 



IOC. Leaflets coarsely toothed and lobed. Koelreuteria. 

 Leaflets only toothed. 101. 

 Leaflets entire. Cladrastis (Maackia). 



101. Leaves abruptly pinnate: buds very small. Gleditsia. 

 Leaves odd-pinnate : buds rather large. Sorbus. 



102. Leaflets entire or slightly crenate or serrate. 103. 

 Leaflets distinctly serrate : buds hairy. Melia. 



103. Twigs moderate : pith small. Gleditsia. 

 Twigs stout : pith large, chocolate colored. Gymnocladus. 



Leaves opposite. 



104. Leaves simple. 105. 



Leaves pinnately compound. 112. 



Leaves palmately compound. Aesculus. 



Simple. 



105. Leaves not uniformly lobed. 106. 



Leaves regularly palmately lobed. Acer. 



106. Leaves very large, cordate : sap not milky. Paulownia. 

 Leaves not very large. 107. 



107. Leaves round-cordate, often separated. Cercidiphyllum. 

 Leaves not heart-shaped. 108. 



108. Leaves all in opposite pairs. 109. 



Leaves often alternate, or else sap milky, no. 



109. Leaf-scars small : leaves with twinned hairs. Cornus. 

 J-eaf-scars large : without twinned hairs. Fraxinus. 



