26 BULLETIN 816, U. S. DEPARTMENT OF AGRICULTURE. 
HONEY LOCUST. 
The honey locust! is a large, open, round-headed, fine-foliaged tree, 
admitting much light through its top. (Fig. 19.) The common 
form has stiff spines 2 to 6 inches long, or even longer. There is also 
a form without spines, which is the one that should be used for street 
planting. It is a useful tree in regions 1, 2, 3, 9, 10, and 11, but is 
especially valuable for planting in regions 6, 7, and 8, and may 
prove useful in region 5. 
Fig. 19.—A street shaded with honey locusts, as seen in late summer. Washington, D.C. 
HORSE-CHESTNUT. 
The horse-chestnut? has handsome blossoms that are very showy, 
and when in bloom an avenue of these trees commands attention. 
It is a close relative of the buckeye, or Ohio buckeye, which is also 
a handsome tree, though less desirable. It is objectionable because 
it is likely to be broken by boys clubbing it for its nuts, which are 
inedible, or where its leaves are affected with a midsummer blight 
which makes it unsightly during the remainder of the season. It is 
a medium-sized round-headed tree that does much better under 
surburban than under city conditions. It thrives in regions. 1, 2, 
3, and 10. 
1 Gleditsia triacanthos L. 
2 Aesculus hippocastanum L. 
