Trees for Town and City Streets. 



13 



The silver wattle is much like the black wattle except that its 

 leaves and young branches are covered with a whitish down. 



AILANTHUS. 



The ailanthus, or tree of heaven, is a tall, broad, handsome tree 

 that is especially valuable in the heart of closely built or smoky 

 cities. The staminate and pistillate flowers are borne on separate 

 trees. Only the pistillate trees should be used, as the odor of the 

 blossoms of the staminate ones is very objectionable for about 10 

 days in late spring. These may be produced by grafting from pistil- 



FIG. 7. White ash trees on a street in Washington, D. C. 



late trees or by propagating from suckers or root cuttings from such 

 trees if they have not been grafted. The ailanthus may not suc- 

 ceed in regions 5 and 13. 



ASH. 



Three kinds of ash trees are useful for street planting. 



The white ash (fig. 7) is a large oval-headed tree, reasonably satis- 

 factory on rich lands in regions 1, 2, 3, 4, 9, 10, 11, and 12, but it is 

 better adapted to suburban than to urban conditions. 



The green ash is one of the few successful trees in regions 6, 7, 

 and 8 and may succeed in region 5. It grows well throughout the 

 remainder of the United States, but is of less value than other trees 

 there. It is much smaller than the white ash, with a broad round top. 



The European ash is a large, handsome, round-headed tree suited 

 to regions 1, 2, 3, and 4, 



