EXOGENOUS SERIES BROADLEAF WOODS. 23 



Bur Oak. Quercus macrocarpa Michx. 



Nomenclature . (Sudworth. ) 



Bur Oak (local and common Mossycup Oak (Mass., Pa., 



name). Del., Miss., La., Tex., Ark., 



Overcup Oak (R. I., Del., Pa., 111., Iowa, Neb., Kan.). 



Miss., La., 111., Minn.). Scrub Oak (Neb., Minn.). 



Mossycup White Oak (Minn. ). Overcup White Oak (Vt. ). 



Locality. 



New Brunswick, New England, westward intermittently to 

 Montana and Texas. 



Features of Tree. 



Seventy to one hundred and thirty feet in height, five to seven 

 feet in diameter. Deep opposite depressions to leaves. 

 Mossy, fringed border at top of acorn-cup. Corky wings on 

 young branches. 



Color, Appearance, or Grain of Wood. 



Heartwood rich brown, sapwood lighter, close-grained, broad 

 conspicuous medullary rays. 



Structural Qualities of Wood. 



Heavy, hard, strong, tough, very durable in contact with 

 ground. 



Representative Uses of Wood. 

 Similar to those of Quercus alba. 



Weight of Seasoned Wood in Pounds per Cubic Foot. 



46.00. 

 Modulus of Elasticity. 



1,320,000. 

 Modulus of Rupture. 



13,900. 



Remarks. 



Extends farthest west and northwest of any other Eastern oak. 

 Especially recommended for prairie planting. 



