62 
TREES AS GOOD CITIZENS 
from insects is another fruitful source of dissatisfaction 
with this species. Its use should not be recommended 
in regions more favorable for tree growth, but from the 
Missouri River westward there are many places where its 
use is warranted. 
Ash-Leaved Maple (Box Elder). —Of rapid growth 
and thriving even against adverse conditions, this tree 
is used where other trees 
will fail. While short-lived, 
with a tendency to heave 
and crack sidewalks and 
pavements, and scragglyon 
top, it is most desirable for 
planting under conditions 
unfavorable to other trees, 
and it has its distinct place 
in city shade tree develop¬ 
ment in the Western states. 
It should not be planted where other trees will thrive. 
Lombardy Poplar. —-The stateliness of tall growth 
is the distinguishing characteristic of the Lombardy 
Poplar, the only member of 
the Poplar family which is 
eligible for street planting 
except west of the iooth 
meridian. Its erect trunk 
and narrow form, suggest¬ 
ing the spire of a lofty cathe¬ 
dral, lend themselves well to 
the dignified beautification 
of a narrow street, although 
little shade is produced. It 
is frequently disfigured by Poplar canker disease. The tree 
grows rapidly and its life is comparatively short. 
