DESCRIPTION OF TREES. 



Note i.- — Those species are considered trees (in dis- 

 tinction from shrubs) which, as the rule, spring from the 

 ground with a single branching trunk. 



Note 2. — The arrangement of the illustrations and 

 descriptions under each section is according to the natural 

 order of the genera. 



Note 3. — In using the guide and the following leaf- 

 illustrations it should be remembered that leaves from 

 vigorous young sprouts are not usually the best specimens. 

 It is seldom that two leaves, even upon the same mature 

 branch, exactly agree ; but they follow the type, while 

 often the younger growth varies from it. 



Note 4. — When describing the trees, items that are 

 specially helpful in determining the species are given in 

 italics. 



