EXOGENOUS SERIES BROADLEAF WOODS. 83 



Poplar, Largetooth Aspen. Populus grandidentata Michx. 



Nomenclature. (Sudworth.) 



Poplar, Largetooth Aspen White Poplar (Mass.). 



(local and common names). Popple (Me.). 

 Largetooth Poplar (N. C.). Large American Aspen (Ala. ). 



Large Poplar (Tenn.). 



Locality. 



Nova Scotia and Delaware, westward intermittently to Minne- 

 sota, Alleghany Mountains to Kentucky and Tennessee. 



Features of Tree. 



Sixty to eighty feet high, two feet or more in diameter. Irreg- 

 ular points or teeth on margins of leaves. Smooth gray bark. 



Color, Appearance, or Grain of Wood. 



Heartwood brownish, sap wood nearly white, close-grained, 

 compact structure. 



Structural Qualities of Wood. 

 Soft, light, weak. 



Representative Uses of Wood. 



Paper-pulp and occasionally wooden ware. 



Weight of Seasoned Wood in Pounds per Cubic Foot. 



28. 

 Modulus of Elasticity. 



1,360,000. 

 Modulus of Rupture. 



10,200. 



Remarks. 



The several "poplars" are much prized for paper-pulp. The 

 quaking aspen (P. tremuloides) has long leaf-stalks flattened 

 vertically to the leaf-surface, so that leaves tremble in slight 

 winds. 



