34 Leaves opposite or whorled, but all members of a pair or group 

 sometimes not quite on the same level ; occasionally also 

 single on spurs _ 35 



34 Leaves spirally arranged, never 4-ranked, occasionally also clus- 

 tered on spurs 51 



SIMPLE OPPOSITE DECIDUOUS LEAVES 



35 Leaves toothed, wavy-margined or lobed ; or both lobed and 



toothed (or wavy) 36 



35 Leaves entire, or angled with entire sides 42 



36 Leaves palmately veined or palmately lobed or both 37 



36 Leaves pinnately veined ; not lobed 38 



o7 Leaves unlobed, wavy-toothed, somewhat heart-shaped, 5-10 

 cm. long; winter-buds appressed, end-bud absent, side-buds 

 showing 1 or 2 scales 



KATSURA-TREE (CERCIDIPHYLLUM) 



37 Leaves lobed, or if unlobed then differing from the above de- 

 scription of leaves and buds MAPLE (ACER) 



38 Winter-buds superposed; teeth of leaves mostly above middle 



SWAMP PRIVET (FORESTIERA) 



38 Winter-buds usually solitary or side by side ; if superposed then 



teeth of leaves not as just described 39 



39 Leaves double-toothed, or wavy-toothed and bark white-striped 



MAPLE (ACER) 



39 Leaves single-toothed or wavy; bark not white-striped 40 



40 Winter-buds showing one pair of scales 



BLACK-HAW, NANNY- or SHEEP-BERRY (VIBURNUM) 



40 Winter-buds showing more than 2 scales 41 



41 Twig typically brown, often ending in a spine ; bundle-scars 

 usually 3, or one forming a horizontal line through center of 

 leaf-scar BUCKTHORN (RHAMNUS) 



41 Twig typically green, not spiny; bundle-scar one, compound, 



near top of leaf-scar SPINDLE-TREE (EVoNYMUS) 



11 



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