40 THE PRINCIPAL SPECIES OF WOOD. 



Oregon Ash. Fraxinus oregona Kutt. 



Nomenclature. 



Oregon Ash (Calif., Wash., Oregon). 



L Padfic coast, Washington to California. Best developed in 

 bottom lands, southwestern Oregon. 



Features of Tree. 



Fifty to occasionally seventy-five feet in height, one to o: 

 and one-half feet in diameter. Dark grayish-brown, bark 

 exfoliates in thin scales. 



Color, Appearance, or Grain of Wood. 



Heartwood brown, sapwood lighter, coarse-grained, c 

 structure, numerous thin medullary rays. 



Structural Qualities of Wood. 

 Rather light, hard, not strong. 



Representative Uses of Wood. 



Manufacture of furniture, carriage-frames, cooperage, and fuel. 



Weight of Seasoned Wood in Pounds per Cubic Foot. 



35- 

 Modulus of Elasticity. 



1,200,000. 

 Modulus of Rupture. 



9400. 



Remarks. 



One of the valuable deciduous trees of the Pacific coast 

 Thrives only on moist soils and in moist climates. 



" Mountain Ash " is either Pyrus americana or Pyrus sambucifolia. Both 

 species, with their bright red berries, are to be classed as shrubs rather than trees; 

 their light, soft, weak, close-grained woods having no economic importance, save 

 perhaps for fuel The series is partially as follows: also see page 34. 

 Pyrus malus (Common apple). Pyrus americana (Mountain ash). 



Pyrus coronaria (American crab-apple). Pyrus sambucifolia (Mountain ash). 

 Pyrus communis (Common pear). Pyrus ancuparia (Rowan tree, European 



Pyrus vulgaris (Common quince). Mountain ash). 



The Toothache Trees, Xanthoxylum americana and Xanthoxylum clava-herculis 

 (Linn.), are known as ash and prickly ash. The gopher wood, Cladrastis tinctoria, 

 is yellow ash. These woods are not important. 



