84 Trees with Simple Leaves. [An 



Genus POPULUS, L. (Aspen, Poplar.) 



From a Latin word meaning the people ; either because the tree was often planted 

 along public walks, or on account of the restlessness of its leaves. 



Fig. 44. Aspen, White Poplar. P. tremuloides, Michx. 



Leaves, SIMPLE ; ALTERNATE ; EDGE SHARP-TOOTHED, with 

 rounded hollows between. 



Outline, rounded. Apex, short, sharp-pointed. Base, 

 slightly heart-shaped. 



Leaf-stem, slender and very much flattened sidewise. 



Leaf, two to two and a half inches wide, and usually about 

 one half inch shorter than wide ; dark green ; smooth 

 on both sides when mature, with a slight down on the 

 edge. Ribs distinct above and below and whitish. 



Bark of trunk, greenish-white and smooth, often with 

 blotches of very dark brown, especially under the 

 ends of the branches. The bark is exceedingly bitter. 



Found, from Northern Kentucky and the mountains of 

 Pennsylvania northward to Hudson Bay and New- 

 foundland, northwest to the Arctic Ocean, and along 

 the Rocky Mountain slopes. It is the most widely 

 distributed of North American trees. 



A tree twenty to fifty feet high, with white, soft 

 wood that is largely used in place of rags in making 

 coarse paper. The tremulousness of its foliage, which 

 the slightest breeze stirs, is due to the thinness of the 

 sidewise-flattened leaf-stems. 



