9 Trees with Simple Leaves. [AII 



Fig. 47. Cottonwood, Poplar, Necklace Poplar, River Poplar. 



P. momllfera, Ait. P. angulata, Ait. 



Leaves, SIMPLE ; ALTERNATE ; EDGE SOMEWHAT IRREGULARLY 

 TOOTHED. 



Outline, broad egg-shape (approaching triangular-shape). 

 Apex, long, taper-pointed. Base, squared, slightly 

 hollowed, or slightly pointed. 



Leaf-stem, long and slender and much compressed sidewise. 



Leaf, two to three and a half inches long (much larger on 

 young shoots) ; length and width nearly the same ; 

 smooth ; ribs distinct and whitish on both sides, 

 irregular, and branching. 



Bark of trunk, light " granite-gray," smooth on young 

 trunks, becoming somewhat rough with age, and with 

 rounded up-and-down furrows. New and vigorous 

 shoots are green, and marked with short white or 

 brownish lines. 



Seeds, covered with a white, cotton-like fibre. 



Found, from Western New England southward to Wes- 

 tern Florida, westward to the Rocky Mountains. 

 The common " cottonwood " of the West, bordering 

 all streams flowing east from the Rocky Mountains. 



A tree eighty to one hundred feet high. The very 

 light and soft wood is largely used in making paper pulp, 

 for light boxes, and for fuel. 



Experiments have been made in separating and weav- 

 ing the cottony fibre of the poplar seeds. It can be 

 manufactured into cloth, but not in paying quantity and 

 quality. 



