124 Leaves with 3 almost equal veins near base of blade 



HACKBERRY, SUGAR-BERRY (CELTIS) 



124 Leaves strictly pinnate, not as just described 125 



125 Leaves narrow-oval or oblong, coarsely toothed and sometimes 



bristled CHESTNUT (CASTANEA) 



125 Leaves somewhat heart-shaped or broad-oval or triangular, not 



bristled, often finely toothed 126 



126 Leaves broad-oval or triangular, not usually lop-sided, margin 



irregularly and often doubly toothed ; bark of trunk whitish 

 or brightly colored or dark, smooth or peeling or broken 

 into scales; lenticels often stretched sidewise; spurs com- 

 mon BIRCH (BETULA) 



126 Leaves broad-oval or heart-shaped, usually lop-sided at base of 



blade, margin usually regularly toothed ; bark dark, other- 

 wise not as just described; lenticels not stretched; spurs 

 not common LINDEN, BASSWOOD (TILIA) 



127 Bundle-scars a dozen or so, irregularly scattered 



OAK (QUERCUS) 



127 Bundle-scars 6-8, in horizontal line across top of leaf-scar ; bud- 

 scales hairy at base (EUPTELEA) 



127 Bundle-scar one 128 



127 Bundle-scars 3-5 130 



128 Winter-buds superposed, showing about 4 fleshy scales 



SNOWDROP-TREE, SILVER-BELL TREE (HALESIA) 



128 Winter-buds not as just described 129 



129 Leaves 8-20 cm. long, distinctly toothed, with an acid taste; 



winter-buds solitary 



SORREL-TREE, SOURWOOD (OXYDENDRUM) 



129 Leaves less than 8 cm. long unless teeth are very faint, sweet- 



tasting; winter-buds solitary or superposed 



SWEETLEAF (SYMPLOCOS) 



130 Height of largest buds about 3 or 4 times their width 131 



130 Height of largest buds less than 3 times their width 132 



131 Winter-buds hairy or sticky, woolly inside; bud-scales not 



twisted ; leaves irregularly or doubly toothed 



WHITE BEAM-TREE, MOUNTAIN-ASH (SORBUS) 

 131 Winter-buds not as just described; bud-scales sometimes twist- 

 ed; leaves singly toothed SHADBUSH (AMELANCHIER) 



21 



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