SPECIES FOR STREET-PLANTING 19 



bark affords a pleasing contrast to its bright green foliage, 

 and in the winter the fineness of its branches and the 

 slightly upward turn of the slender twigs impart to it a 

 grace possessed by few other native trees. 



The tree is generally distributed throughout eastern 

 North America and naturally grows in low swamp lands, 

 and loves the borders of streams, which it sometimes covers 

 to the exclusion of other trees. Hence it requires a moder- 

 ately rich and rather moist soil when planted on a street. 



The tree grows rather slowly when first transplanted,- 

 and is apt to look less promising than the hard maples ; but 

 when it is once established it makes rapid progress. The 

 red maple is moderately free from insect attack. Some- 

 times it is a prey of the leopard moth, and frequently in the 

 early summer these trees are infested with plant lice that 

 cause the leaves to curl. The plant lice, however, seldom 

 do much damage, but the leopard moth requires the same 

 treatment as in the case of the hard maple. The trees 

 should be planted about thirty-eight or forty feet apart 

 when set on the streets. 



Box Elder or Ash-Leaved Maple {Acernegundo Linn.). — 

 The box elder has a wide natural range. Its habitation ex- 

 tends from the eastern slope of the Alleghany Mountains 

 west to the foothills of the Rockies, and south to Texas. 

 The tree is of rapid growth and is very extensively used in 

 cities in the middle part of the United States. It is not 

 native along the Atlantic coast, but is planted for ornament 

 and shade. 



White or Silver Maple {Acer saccharinum Linn.). — While 

 the sugar maple, the Norway maple, and the red maple make 

 admirable street-trees, the white maple is one of the poor- 

 est. The characteristic that has recommended it for most 



