Studies of Trees | Page 9

Fig. 31, are quite red.
[Illustration: FIG. 29.--Leaf of the Silver Maple.]
Leaf: Whitish underneath with three-pointed lobes. Fig. 32.
Form and size: A medium-sized tree with a narrow, round head.
Range: Eastern North America.
Soil and location: Prefers moist places.
Enemies: Leaf blotches (Rhytisma acerinum) which, however, are not very injurious.
Value for planting: Suitable as a shade tree for suburban streets. Its rich red leaves in the
fall make it attractive for the lawn.
[Illustration: FIG. 30.--Bark of the Red Maple.]
Commercial value: Its wood is heavy, close-grained, and takes a good polish. Used for
furniture and fuel.
Other characters: The bud is small, round, and red. The flowers appear before the leaves
are out in the early part of April.
[Illustration: FIG. 31.--Twig of the Red Maple.]
[Illustration: FIG. 32.--Leaf of the Red Maple.]

Other common names: The red maple is sometimes known as swamp maple.
[Illustration: FIG. 33.--Twig of Norway Maple.]
Comparisons: The red maple is apt to be confused with the silver maple, but the latter can
be distinguished by its turned-up twigs and scaly bark over the whole trunk of the tree,
which presents a sharp contrast to the straight twig and smooth bark of the red maple.
The latter has a bark similar to the beech, but its branches are opposite, while those of the
beech are alternate.
NORWAY MAPLE (Acer platanoides)
Distinguishing characters: The bud, Fig. 33, is *oval and reddish-brown* in color; when
taken off, a *milky juice exudes*. The bark is close. Fig. 34
[Illustration: FIG. 34.--Bark of Norway Maple.]
Leaf: Like the leaf of the sugar maple but thicker in texture and darker in color. Fig. 35.
Form and size: A tall tree with a broad, round head.
Range: Europe and the United States.
Soil and location: Will grow in poor soil.
Enemies: Very few.
Value for planting: One of the best shade trees.
Commercial value: None.
Other characters: The bark is close like that of the mockernut hickory.
Comparisons: The Norway maple is apt to be confused with the sycamore maple (Acer
pseudoplatanus), but differs from the latter in having a reddish bud instead of a green bud,
and a close bark instead of a scaly bark.
BOX ELDER (Acer negundo)
Distinguishing characters: The terminal *twigs are green*, and the buds are round and
small. Fig. 36.
Leaf: Has three to seven leaflets.
[Illustration: FIG. 35.--Leaf of Norway Maple.]
Form and size: A medium-sized tree with a short trunk and wide-spreading top.
Range: Eastern United States to the Rocky Mountains.

Soil and location: Grows rapidly in deep, moist soil and river valleys, but accommodates
itself to the dry and poor soil conditions of the city.
[Illustration: Figure 36.--Twig of the Box Elder.]
Enemies: Few.
Value for planting: Used as a shade tree in the Middle West, but the tree is so ill formed
and so short-lived that it is not to be recommended.
Commercial value: None. The wood is soft.
Other characters: The bark of the trunk is smooth and yellowish-green in young trees and
grayish brown in older specimens. The flowers appear in the early part of April. The fruit
takes the form of yellowish-green keys which hang on the tree till late fall.
Other common names: The box elder is also commonly known as the ash-leaf maple.

GROUP VI. TREES TOLD BY THEIR FORM: ELM, POPLAR, GINGKO AND
WILLOW
How to tell them from other trees: The trees described in this group are so distinctive in
their general form that they may, for the purpose of study, be grouped together, and
distinguished from all other trees by this characteristic.
How to tell them from each other: The American elm is vase-like in shape; the Lombardy
poplar is narrow and spire-like; the gingko, or maidenhair tree, is odd in its mode of
branching; and the weeping willow is extremely pendulous.
AMERICAN ELM (Ulmus americana)
Distinguishing characters: The tree can be told at a glance by its general branching habit.
The limbs arch out into a wide-spreading *fan or vase-like crown* which loses itself in
numerous fine drooping branchlets. See Fig. 37.
[Illustration: FIG. 37.--American Elm.]
Leaf: The leaves are simple, alternate, and from 2 to 5 inches long.
[Illustration: FIG. 38.--English Elm in Winter.]
Form and size: It is a tall tree with a trunk that divides a short distance above ground. Its
general contour, together with the numerous branches that interlace its massive crown,
give the elm an interesting and stately appearance which is unequaled by any other tree.
[Illustration: FIG. 39.--Lombardy Poplar.]

Range: Eastern North America.
Soil and location: The elm prefers a deep, rich and moist soil, but will adapt itself even to
the poor soil of the city street.
Enemies: The leopard moth, a wood-boring insect, and the elm leaf beetle, a leaf-eating
insect, are