STREET TREES. 21 



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- 

 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. 



There are three kinds of ash trees that are useful for street planting. 



The white ash ^ is a large oval-headed tree, reasonably satisfactory 

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

 adapted to suburban than urban conditions. 



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

 and 8 and naay 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 Euroj^ean ash ^ is a large, handsome, round-headed tree suited 

 to regions 1, 2, 3, and 4. 



CAMPHOR. 



The camphor tree ^ is a large, handsome, oval-headed evergreen 

 that wiU succeed in the southern half of region 2, in regions 3, 5, and 13, 

 and in the warmer parts of region 12. It will endure more frost than 

 the orange, and where it is successfully grown it is deservedly poj^ular. 



CHINABERRY. 



The chinaberry,^ sometimes known as tJie China tree, is a small, 

 round-headed, short-lived tree that will grow in regions 2, 3, 5, 8, 

 11, 12, and 13 and near the southern edge of region 6. It is too short 

 lived to be considered for jjlanting where other trees will grow 



The umbrella tree,^ or Texas umbrella, is a small, compact form of 

 the chinaberry with an umbrella-shaped top. It is useful for formal 

 effects, as in the parking on a wide street where taller trees are used 

 on the side. It will grow in regions 2, 3, 5, 8, 11, 12, and 13 and in 

 the southern parts of region 6. 



1 Acacia decurrens dealbata F. Muell. ^ Fraxinus excelsior L. 



2 Ailanthus altissima (Mill.) Swingle {A. glandu- « Cinnamomum camphora (L.) Nees and Eberm. 

 losa Desf.)- ' Mclia azedarach L. 



3 Fraxinus americana L. ^ ^ifeUa azedarach umbracuUformis Berckmans and 

 * Fraxinus lanceolata Borck. Bailey. 



