SPECIES FOR STREET-PLANTING 49 



the tulip is sometimes called the tulip poplar. It is not to 

 be confounded with poplars, however, as there is no rela- 

 tionship between them, the poplars belonging to the willow 

 family. 



As a shade-tree the tulip ia very beautiful and symmet- 

 rical ; but it is adapted* for only the widest avenues, as it 

 becomes too large for the average street. It thrives best in 

 places where there is a quantity of rich, deep soil, condi- 

 tions which do not obtain along the street curb. While the 

 tulip is moderately free from enemies, its leaves are subject 

 to the attack of an insect that forms the tulip-tree spot gall. 

 These galls are brown spots covering the surface of the 

 leaves in midsummer. The leaves turn yellow and drop 

 from the trees throughout the season. 



The tulip-tree is one of the most difficult trees to trans- 

 plant. Like all the magnolias, it has tender, succulent roots 

 that dry on the least exposure. It is one of the trees that it 

 is quite impossible to transplant in the fall ; for if its roots 

 do not begin immediate growth after planting the tree dies. 



White Ash {Fraxinus americana Linn.). — ^Although so 

 far the ash has not been much used in cities, it possesses 

 many characteristics that recommend it for a shade-tree. 

 It is a rapid grower, perfectly hardy in many sections of 

 the country and has no serious insect enemies. It grows 

 straight and symmetrical, and forms a round top. The foli- 

 age is pleasing in appearance, growing in irregular wavy 

 masses, and not compact like the maples or the oaks. In 

 fact, some sunlight always finds its way through the foliage 

 of this tree, even in midsummer. 



The white ash has compound leaves about ten inches 

 long. They have from five to nine leaflets — ^usually seven. 

 The leaves are dark green in summer, and in autumn turn 



