176 



©ecibuous Erccs. 



Caucasian Walnut, Pterocaria caucasica, is a beautiful 

 hardy tree with broad, spreading crowns, and much smaller 

 than the hickories and walnuts. It has long pinnate leaves 

 of a glossy green with about nineteen leaflets. The fine 





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FIQ. 89.— CAUCASIAN WALNUT IPTEROCARIA CAUCASICAl. 



specimen illustrated grows in 56° N. latitude in Sweden on 

 moderately high, fertile ground. This is the most ornamen- 

 tal tree of the walnut family. 



THE OAK FAMILY. 



Oak, Quercus. — The oaks are among our most beautiful 

 trees and very plentiful in American woods; in fact, they 

 form the main body of most mixed woods, both here and 

 in Europe. The American forms grow more rapidly than 



