16 



BULLETIX S16, IT. S. DEPAETZMEXT OF AGEICULTL'EE. 



valuable as those already demonstrated to be valuable over large 

 areas. Those mentioned have all been tested in a small way. 



Caution should be used in selecting trees with conspicuous flowers 

 and those with edible fruits or nuts, as in many parts of the country 

 such trees are badly mutilated by the public. Even horse-chestnuts, 

 although the nuts are not edible, are often broken by boys clubbing 

 the trees. That public opinion can prevent such vandalism is in evi- 



FiG. 16. — Live oaks, the handsomest southern street tree for broad streets 



P:5394HP 



Biloxi, Miss.; late summer. 



dence all along the Pacific coast and at a few places in the East. 

 Every effort should be made to create a sentiment that will protect 

 these attractive additions to street adornment, but where the senti- 

 ment does not exist it is better to avoid the planting of such trees 

 except in a limited way. 



Besides the native trees there are many introduced trees that have 

 proved valuable and many m:0re that are worthy of trial. ^ A fair 

 trial of promising introduced trees should be made, and the native 

 kinds should be thoroughlv tested. 



TEEES FOR DIFFERENT REGIONS. 



To simplify the discussion of kinds of street trees likely to prove 

 satisfactory, the United States has been arbitrarily divided into the 

 regions shown in figure 17. An endeavor has been made to make 

 each division cover an area having similar gixjwing conditions, so that 

 the trees suggested will be likely to thrive in all its parts. A dis- 



1 As examples of this are a number of new elms such as TTlmus pumila and Ulmus den^a, besides lindens, 

 poplars, and Koelreuteria paniculata, while Pistacia cMnensis is suitable for warm regions. The OflSce 

 of Foreign Seed and Plant Introduction of the United States Department of Agriculture wiU be glad at 

 any time to suggest new trees that are promising for any region. 



