ENDOGENOUS SERIES. 189 



Joshua-tree, Yucca. \ ^ucca arborescent Terr. 

 \ 1 uc ca brevifolia Lngelm. 



Nomenclature. (Sud worth.) 



Joshua-tree, The Joshua, Yucca Cactus (Cal.). 



Yucca, Yucca Tree (Utah, 

 Ariz., N. M., Cal.). 



Locality. 



Central and lower Rocky Mountain region. 



Features of Tree. 



Twenty-five to forty feet in height, six inches to two feet in 

 diameter. 

 Thick outer cover or bark.* 



Color, Appearance, or Grain of Wood. 

 Light brown to white, porous grain. 



Structural Qualities of Wood. 



Light, soft, spongy, flexible in thin sheets. 



Representative Uses of Wood. 



Paper-pulp, souvenirs, boxes, book covers, and other small 

 articles. 



Weight of Seasoned Wood in Pounds per Cubic Foot. 



23- 

 Modulus of Elasticity. 



Modulus of Rupture. 



Remarks. 



Bark is unusual in the case of endogenous trees. Arborescens 

 refers to fact that it is a tree. 



* See paragraph Bark, Endogenous Trees, page 55. 



