FOREST TREES OF THE PACIFIC SLOPE. 



293 



The best marked variety is Quercua dumosa revoluta Sargent, to be looked 

 for especially in the northern and southern range of the species. It is distin- 

 guished by its strongly rolled or curled leaves, more or less coated with whitish 

 hairs, and with prickly borders; the curled edges are turned toward the under 

 surface of the leaf. Leaves of a season's growth adhere to the branches until 



Fig. 131. — Quercus dumosa, 



the succeeding spring, and begin to fall as the new leaves are formed. Acorns 

 are matured in one season. 



Wood light brown, hard, brittle; of no commercial use. The species useful only 

 in assisting, with other desert hill shrubs and small trees, in forming a protective 

 cover on the too scantily clothed dry slopes. Its strong roots go deep into rocky 



