151 Leaflets showing no almost transparent dots in their blades 152 



GOLDEN-CHAIN (LABURNUM) 

 151 Leaflets showing such dots 152 



152 Twigs green, with a spine at each node ; buds hairless, red 



HARDY ORANGE (PONCIRUS) 

 152 Twigs tan-colored, spineless ; buds hairy....HOP-TREE (PTELEA) 



153 Leaves palmately compound 154 



153 Leaves pinnately compound 156 



153 Leaves bipinnately (twice) compound 180 



154 Leaves spirally arranged (ACANTHOPANAX) 



154 Leaves oppositely arranged 155 



155 Mature leaves more than 10 cm. wide; winter-buds showing 

 more than 4 scales 



HORSE-CHESTNUT, BUCKEYE (AESCULUS) 

 155 Mature leaves 5-10 cm. wide; winter-buds showing 2 or 3 scales 



MAPLE (ACER) 



156 Leaves opposite but not always quite on the same level 157 



156 Leaves spirally arranged - 161 



157 Leaflets showing almost transparent dots in their blades 158 



157 Leaflets showing no such dots 159 



158 Each winter-bud almost surrounded by petiole of leaf; leaf- 



scars horseshoe-shaped-.CORK-TREE (PHELLODENDRON) 



158 Each winter-bud exposed in axil of leaf; leaf-scars broadly 



crescent-shaped (EVODIA) 



159 Leaflets coarsely toothed, some usually lobed; upper margin 



of leaf-scar curving down; bundle-scars not more than 7; 

 winter-buds 2-scaled BOX-ELDER (ACER) 



159 Leaflets never lobed, not always coarsely toothed; bundle-scars 



more than 7 if upper margin of leaf-scar curves down 160 



160 Buds showing 3 or more pairs of scales ; upper margin of leaf- 



scar curving up; bundle-scars not more than 7 



ELDER (SAMBUCUS) 

 160 Winter-buds showing 1-3 pairs of scales; upper margin of leaf- 

 scar straight or curving down; bundle-scars more than 7 



ASH (FRAXINUS) 



24 



