4 
STREET TREES. 19 
The rainfall gradually increases from west to east until at about the ninety-eighth 
meridian the conditions are more favorable for tree growth. 
The trees to be relied on are the thornless honey locust, common hackberry, black | 
locust, green ash, ash-leaved maple, the poplars, the Chinese elm, and the American elm 
if it can be watered the first few years after transplanting. The mossy-cup oak is 
another tree worth testing in a small way, as it is native a little east of the ninety- 
eighth meridian. The basswood and Norway maple would probably succeed if 
supplied with plenty of water. 
Region 8.—Region 8 is the southern part of the Great Plains. 
In addition to the deciduous trees recommended for the northern Great Plains 
(region 7) the Mississippi hackberry, Texas umbrella, and chinaberry may be suc- 
cessfully grown. 
Evergreen trees that may be used in region 8 are the Texas palmetto and Parkin- 
sonia. 
Region 9.—Region 9 is the upper Mississippi Valley, including the area from that 
already considered to Lake Michigan and south to southern Kansas. It is more 
favorable to tree growth than regions 6 and 7. 
Trees which will succeed here are the American elm; red, pin, mossy-cup, and 
other native oaks; white ash; sycamore; basswood; and Norway and sugar maples. 
Region 10.—Region 10 includes the northeastern part of the country from eastern 
Illinois to the Atlantic Ocean, and extends southward through the Appalachian 
Mountains. It is most favorable for tree growth. 
The best trees for street planting in region 10 are the red and pin oaks, London 
plane, sycamore, the staminate form of the ginkgo, basswood, tulip, Norway maple, 
white ash, thornless honey locust, American elm, and in the southern portion of the 
region on light land the sweet gum. The red and sugar maples are among the best 
trees for suburban conditions. The hackberry will grow, but should be discarded 
in favor of better varieties. The mossy-cup and chestnut oaks are worthy of trial 
on gravelly soils in the suburbs. 
Region 11.—Region 11 includes the lower Mississippi Valley and the country east 
of the southern Appalachian Mountains, extending from the light lands near the 
South Atlantic and Gulf coasts to the northern limits of the distinctively southern 
flora. 5; 
The typical street trees of this region are the willow oaks (fig. 1) and water oaks, 
the former a valuable street tree, the latter good when young but comparatively 
short lived, with no advantages over the willow oak. Other good trees are the red, 
Spanish, laurel, Darlington, and pin oaks, tulip, sweet gum, American elm, red and 
Norway maples, and the ginkgo. 
Region 12.—Region 12 is the land near the coast from Wilmington, N. C., to the 
Mexican border, exclusive of the southern part of Florida. 
Good deciduous trees for this region are the willow, laurel, Darlington, and Span- 
ish oaks, tulip, sweet gum, sycamore, London plane, American elm, and the stami- 
nate form of the ginkgo. The honey locust, red or scarlet maple, Norway maple, 
and the hackberries are not so good. 
The live oak is the characteristic tree of region 12 (fig. 16) and is the pride of the 
cities that have used it. Even though an evergreen, it is an excellent street tree, 
as it is large, spreading, and open. The palmetto and palms thrive and may be 
used for producing formal effects. The evergreen magnolia is a good broad-leaved 
evergreen. 
Region 13.—Region 13 consists of the southern part of Florida. The deciduous 
trees suitable for this section are the willow, Spanish, and southern red oaks; Ameri- 
can elm; Mississippi hackberry; and in the southern half of the region the 
Poinciana. 
Evergreen trees are better suited to region 13 than to,any other portion of the 
United States except possibly southern California. Among the best are the live and 
