162 
105 a. Leaves 5 in. or more long, with very sharply toothed margins; fruit a prickly 
b 
b. Leaves and fruit not completely as in а........................... 107. 
106 a. Native tree; leaves tapering to the apex. 
American Chestnut. (Castanea dentata.) 
b. Cultivated tree; leaves abruptly pointed at a 
European din tnut. (Castanea sativa.) 
107a. Leaves somewhat rounded, often unequal at the base; fruit leaf-like with 
small gren nutlets attached; buds often reddish and placed to one side 
ME IMPEDIT. I Ие a a ZEE 
b. Trees not dns ПЕЕ NA ag OIE EIU T E ut TIO. 
108 a. Leaves white-woolly beneath; cultivated tree. 
Silver Linden. (Tilia tomentosa.) 
Leave s not о, bene 
b. Native tree; leaves not usually as in a.....Basswood. (Tilia americana 
110a. Bark on trunk peels off in наи, rather энн vertical strips; fruit 
hoP-HEe ЕИ e op o cbe Ironwood. (Ostrya virginiana.) 
b. Bark and fruit not completely as in а............................. II 
111 G. Leaves usually irregularly and deeply toothed or lobed; palmately di 
thorns usually present on the branches; fruit somewhat fle shy 
b Trees ВОО овал ооо II 119. 
112 а. Thorns more ог less curved; leaves broadly ovate, doubly toothed.....113. 
- Thorns straight; leaves obovate or ovate............ IIS 
113 а. Lower surface of leaves — hairy; Hiit with hairy stalks. 
Thorn. (Crataegus mollis.) 
ee a) 
b. Lower surface of leaves not iiy hairy 
114 а. Leaves rounded or heart-shaped at base 
Washington Thorn. (Crataegus cordata.) 
b. Leaves usually tapering at the base. 
i i Thorn. (Crataegus pruinosa.) 
115 а. Thorns 1/2 in. or less long; leaves ovate, 3-15-lobed or cleft; cultivated tree. 
English Hawthorn. (Crataegus oxyacantha.) 
b.: Thoras ii more longere ai ek le dae ce 6. 
116 a. Fruit solitary or 2—3 together, ese when ripe; margin of leaves with broad 
ЕЕЕ чиз Thorn. (Crataegus uniflora.) 
b. Fruit 3 or more together, usually ipei Gane GE AE UA d 117. 
117 а. Leaves usually shining above, not ову toothed; stalks of fruit not hairy 
ockspur Thorn. (Crataegus crus-galli. ) 
b. Leaves not shining above, usually doubly toothed; stalks of fruit hairy..118. 
118 а. Fruit about 1/2 in. in diameter, reddish-brown when ripe; leaves lobed, 
ed Haw. тир несие, ) 
b. Fruit 1/2—1 іп. in diameter, yellow or red wt іре; 1 obed. 
ited Thorn. Onda. dicii: ) 
119 2. Bark on trunk and on branches with horizontal m. arkings usually 1/2 in. or 
more long, ususally 1/4 in. or less broad; bark not with regular longitudinal 
furrows. 
wo Ss же асе с uw аети а о owe v e VUE RACE AC Slate da eer oy eg ERR 
ar. 
