1 84 THE PRINCIPAL SPECIES OF PVOOD. 



limited to the neighborhoods in which such trees flourish, but 

 it is probable that the Bamboo can be much more generally- 

 employed. 



The Endogens include numerous families and many thou- 

 sand species.* The grasses, including wheat, rye, and Indian 

 corn at the North and sugar-cane and bamboo at the South, 

 belong to this group. Most Endogens are herbs; compara- 

 tively few furnish material for structural purposes. The Palms, 

 including the palmetto, rattans, cane palms, and others, the 

 Yucca, including the Joshua tree, Spanish bayonet, and others, 

 and the Bamboos, representatives of the grasses, are thus use- 

 ful. Endogens are also known as Monocotyledons. 



*Bastm (" College Botany," p. 379) divides into about fifty natural orders dis- 

 tributed among seven divisions. Warming ("Systematic Botany," pp. 277, 278) 

 divides into seven families corresponding with Bastin's seven divisions. A. Gray 

 divides into twenty-one orders or families. Coulter ("Plants," p. 237) divides 

 into forty families, including twenty thousand species. 



