KEY TO GENERA AND SPECIES 57 



103. Young twigs hairy. Occasionally cult. Na- 



tive in Eurasia. Black Poplar, Populus 

 nigra L. 



104. Length of blade about twice the width.* 



Central New England westward and north- 



Fig. 100. Balsam Poplar. 



Fig. 101. Downy Poplar. 



ward. ( Fig. 100.) Balsam Poplar, Tac- 

 amahac, Rough-barked Poplar, Populus 

 balsamifera L. 



104. Length of blade scarcely greater than the 

 width* 105. 



* The leaves of the Balsam Poplar are sometimes wide, when 

 they may closely resemble those of the Balm of Gilead, both of 

 which have fragrant sticky buds. The Balm of Gilead leaf has a 

 hairy under surface, while that of the Balsam Poplar is smooth 

 and with a more or less metallic luster. 



