G.92] 



CLASSIFICATION AND DESCRIPTION 



169 



ate teeth ; and when young densely cov- 

 ered with white, silky wool, but soon be- 

 coming smooth on both sides ; leaf, when 

 young, reddish-yellow ; petiole com- 

 pressed. A large tree, 60 to 80 ft. high, 

 with rather smoothish gray bark. Woods ; 

 common northward, rare southward, ex- 

 cept in the Alleghanies. Wood soft and 

 extensively used for paper-making. 



P. erandident&ta. 



4. P6pulus heteroph^lla, L. (DOWNY- 

 LEAVED POPLAR.) Leaves heart-shaped 

 or roundish-ovate with small, obtuse, in- 

 curved teeth ; white-woolly when young, 

 but soon becoming smooth on both sides 

 except on the veins beneath. Leafstalk 

 slightly compressed. Shoots round, to- 

 mentose. Buds not glutinous. A large 

 tree, 70 to 80 ft. high, not very common; 

 found from western New England to Illinois, and southward. 



P. heterophylla. 



5. Populus dilatata, L. (LOMBARDY 

 POPLAR.) Leaves deltoid, wider than 

 long, crenulated all round, both sides 

 smooth from the first; leafstalk com- 

 pressed ; buds glutinous. A tall tree, 80 

 to 120 ft. high ; spire-like,of rapid growth, 

 with all the branches erect; the trunk 

 twisted and deeply furrowed. Frequently 

 planted a century ago, but now quite rare 

 in the eastern United States. From Eu- 

 rope. It is thought to be a variety of 

 Populus nigra (No. 7). 



P. dilatata. 



P. monilifera, 



6. Populus monilifera, Ait. (COT- 

 TONWOOD. CAROLINA POPLAR. NECK- 

 LACE-POPLAR.) Leaves large, broadly 

 heart-shaped or deltoid, serrate with car- 

 tilaginous, incurved, slightly hairy teeth. 

 The rapid-growing young twigs very an- 

 gular and bearing very large (6 to 9 in. 

 long) leaves. A very large (80 to 100 ft. 

 high) tree, common in the Mississippi val- 

 ley, but found in western New England 

 and often planted. 



