61 Twigs hairy; leaves slightly hairy and dull green on upper sur- 

 face, more hairy on under surface, 6-12 cm. long, faintly 

 toothed or entire MEDLAR (MESPILUS) 



61 Twigs and leaves not exactly as just described PEAR (PYRUS) ^ 



SIMPLE SPIRAL LEAVES, UNARMED TWIGS 



62 Stipules or stipule-scars almost or quite encircling twig at base 



of each petiole "^ 



62 Encircling scars only at beginning of each year's growth 66 



63 Base of petiole cone-shaped, covering winter-bud 



SYCAMORE (PLATANUS) 



63 Winter-buds visible in leaf-axils 64 



64 Outer end of leaf square or notched as if tip were cut oflF 



TULIP TREE (LIRIODENDRON) 



64 Outer end of leaf pointed or rounded 65 



65 Leaves thin, sometimes toothed, winter-buds showing several 



scales BEECH (FAGUS) 



65 Leaves thick, entire, winter-buds showing one scale..(MAGNOLIA) 



66 Juice of young leaves rubbery, making elastic cords when leaf 



is broken; leaf-margin toothed (EUCOMMIA) 



66 Juice of young leaves gummy; leaf-margin entire 



CHITTAM-WOOD, AMERICAN SMOKE-TREE (COTINUS) 



66 Juice of young leaves milky ; leaves varying in shape 67 



66 Juice of young leaves watery, sometimes spicy or acid 68 



67 Petioles 3-10 cm. long; visible bud-scales 2-3; tree-trunk 



smooth PAPER MULBERRY (BROUSSONETIA) 



67 Petioles usually not more than 3 cm. long; visible bud-scales 



3-6; tree-trunk usually scaly MULBERRY (MORUS) 



68 Leaves entire "V 



68 Leaves lobed; lobes entire or toothed 86 



68 Leaves variously toothed or wavy-margined ; not lobed 101 



14 



