b. Bark: not completely as in ac. i LI ewe EU NIS eene y iode e ах 
taod. Léaves triangular in shapes орен секат 121: 
. Leaves rather ovate to oblong in shape- уон ee 122. 
121 a. Bark close on trunk not in loose sheets; native tr 
ray ao adipis populifolia.) 
b. Bark in rather loose sheets on the trunk; aaa ed t 
European White de Id alba.) 
122 a. Bark creamy white, in rather loose edid on the trunk of older 
Paper Birch. (Betula hte A ) 
b. Bark yellowish, gray, or brown, not whitish..............0000ee00: 123. 
123 a. Bark yellowish, in rather thin loose sheets on the trun 
Yellow a. (Betula lutea.) 
b. Bark not: yellowish.ons араа А as у» rosae ieee ee 124. 
12448. Fruit usually present on the tree, consisting of hard or woody ent 
short twigs present on the branches; bark of twigs not тыну ура 
rather ovate; ао о e А МЕО ES VER CIA Mea OX 125. 
b. Pruit.not present; bark of twigs bitber... 2. ui SE VOS. 126. 
125 а. Bark greenish-brown to reddish, in thin loose layers; bark not usually sweet 
or aromatic; trees usually growing in damp places. 
Red Birch. (Betula nigra.) 
b. Bark dark-brown or ashy-gray, close on the trunk or peeling in flakes or 
plates; bark sweet and aromatic; common tree in rather dry places 
S 
126 a. Leaves mostly oblong, teeth on margin usually incurved; often brownis 
hairs along the midvein beneath...Black Cherry. (Prunus serotina.) 
b. Leaves mostly obovate; teeth on margin somewhat spreading, usually 
Ch 
MLE eee ae ULLA EV eis Choke Cherry. (Prunus virginiana.) 
127 a. Leaves with all secondary veins parallel, prominent and oblique to the midrib. 
128. 
. Leaves not with secondary veins parallel as in a 13І 
128 а. Fruit cone-like; leaves with the blade equal at the base. 
European Alder. (Alnus glutinosa.) 
b. Fruit always wanting; leaves with blade usually unequal at the base; outer 
о Bonicwhat ГОРКУ oc. cs se Ne ERA RM Rd ge ee be I2 
129 a. Leaves not noticeably rough above; buds not hairy. 
ican Elm. (Ulmus americana.) 
Ameri 
b. Leaves rough on upper surface; buds һаїгу....................... 130. 
130 а. Native = upper branches drooping and slender; tree usually growing in 
moist places. Slippery Elm. (Ulmus fulva.) 
b.c tud tree; upper branches ascending or horizontal, rather coarse. 
English ( Ulmus campestris.) 
131 а. Leaves usually not more than twice as long as bid. lateral buds with 
ПОЕТО MORIR. Duas vezes ep oo Cais ak Orel RAPERE TE hrs Pre 
b. Leaves храм more than twice as long as broad; lateral buds with а кук 
quu Se ой у Ne bm CMM БУТЕ Б ресей 141. 
132 a. ipii of leaves flattened laterally............- eee erre 133. 
6 
b. Petioles of leaves not flattened laterally..........-.. 13 
133 а. Leaves white-woolly beneath and lobed... White Poplar. (Populus alba.) 
b. Leaves not completely as in a a 134 
