109g. 
TREES. 17 
. Buds solitary. Pterocarya. 
Buds superposed. Juglans. 
. Buds concealed by a membrane after leaf-fall. Robinia. 
Buds quickly exposed. 96. 
. Leaf-scar nearly encircling the bud. 97. 
Leaf-scar not surrounding the bud. 98. 
7, Leaflets small (2 K 4 cm.). Sophora. 
Leaflets large (often 5 X I0 cm.). Cladrastis. 
. Leaf-scars large, shield-shaped: buds superposed. 99. 
Leaf-scars narrow or small. 100. 
. End-bud present: buds ovoid. Carya. 
End-bud deciduous: buds half-round, Sapindus. 
. Leaflets coarsely toothed and lobed. Koelreuteria. 
Leaflets only toothed. Ior. 
Leaflets entire. Cladrastis (Maackia). 
. Leaves abruptly pinnate: buds very small. Gleditsia. 
Leaves odd-pinnate: buds rather large. Sorbus. 
. Leaflets entire or slightly crenate or serrate. 103. 
Leaflets distinctly serrate: buds hairy. Melia. 
. Twigs moderate: pith small. Gleditsia. 
Twigs stout: pith large, chocolate colored. Gymnocladus. 
Leaves opposite. 
. Leaves simple. 105. 
Leaves pinnately compound. 112. 
Leaves palmately compound. Aesculus. 
Simple. 
. Leaves not uniformly lobed. 106. 
Leaves regularly palmately lobed. Acer. 
. Leaves very large, cordate: sap not milky. Paulownia. 
Leaves not very large. 107. 
. Leaves round-cordate, often separated. Cercidiphyllum. 
Leaves not heart-shaped. 108. 
. Leaves all in opposite pairs. 109. 
Leaves often alternate, or else sap milky. I10, 
Leaf-scars small: leaves with twinned hairs, Cornus. 
Leaf-scars large: without twinned hairs. Fraxinus, 
