capable of destroying such native species as Bechtels 
Crab in two years. The Crab Apples have perhaps more 
enemies than many of the ornamentals; they serve as food 
for every native caterpillar, they have the usual quota 
of fungus diseases, and they are often seriously injured 
by borers and scale insects. However, they are so lovely 
when in flower, that the additional care is not too great 
a burden. Most of them can be thought of as requiring 
about as much room as an apple tree, although some forms 
grow much larger. On a good site, most varieties will 
grow about one-half foot higher each year. 
DOGWOOD 
The Dogwood (Cornus florida) would never be a street 
tree, although it maybe used in a parkway. It is usually 
part of the understory of our forest or it grows at the 
wood-edge. In the primeval woods, it attained a size far 
greater than the Dogwoods we see today. The usual flower 
color is white, although pink and re'd ones can be obtained 
from nurseries. In all probability, even the White Dog- 
woods carry a little pink, since it appears that certain 
combinations of spring weather impart a very pale pink 
touch to our native white-flowered kinds. The Dogwood is 
not hard to transplant, nor is it especially hard to 
maintain when established. It is capable of growing 
without too much attention, and it produces a dependable 
display almost every year, but a heavy mulch is required 
when growing as an ornamental. 
£LM 
This is a large family of extremely important shade^ 
trees. Two serious diseases have focused national atten- 
tion on them and until both the Dutch Elm disease and 
Phleom Necrosis can be controlled, it would be unwise to 
plant more Elms iUlmus sp.) , no matter how necessary they 
are, or how important they may be for a particular land- 
scape effect. 
EUONYMUS 
shrub 
or small trees or climbers. The largest of the tree 
types able to stand our summers is the Vinterberry 
Euonymus, iEuonymus Bungeanus) . This species develops ^^ 
round-top tree twenty-five feet high with a trunk ai^m 
7 
