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قراءة كتاب Studies of Trees

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‏اللغة: English
Studies of Trees

Studies of Trees

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دار النشر: Project Gutenberg
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apple,” commonly found on this tree, represents a stage of the apple rust, and for that reason it is not desirable to plant such trees near orchards. Its wood is also sometimes attacked by small boring insects.

Value for planting: Its characteristic slender form gives the red cedar an important place as an ornamental tree, but its chief value lies in its commercial use.

Commercial value: The wood is durable, light, smooth and fragrant, and is therefore used for making lead-pencils, cabinets, boxes, moth-proof chests, shingles, posts, and telegraph poles.

Other characters: The fruit is small, round and berry-like, about the size of a pea, of dark blue color, and carries from one to four bony seeds.

Other common names: The red cedar is also often called juniper and red juniper.

Comparisons: The red cedar is apt to be confused with the low juniper (Juniperus communis) which grows in open fields all over the world. The latter, however, is generally of a low form with a flat top. Its leaves are pointed and prickly, never scale-like, and they are whitish above and green below. Its bark shreds and its fruit is a small round berry of agreeable aromatic odor.

Arbor-Vitae; Northern White Cedar (Thuja occidentalis)

Distinguishing characters: The branchlets are extremely flat and fan-like, Fig. 13, and have an agreeable aromatic odor when bruised. The tree is an evergreen with a narrow conical form.

[Illustration]
Fig. 13.—Twig of the Arbor-Vitae.

Leaf: Leaves of two kinds, one scale-like and flat, the other keeled, all tightly pressed to the twig (see Fig. 13).

Form and size: A close, conical head with dense foliage near the base. Usually a small tree, but in some parts of the northeastern States it grows to medium size with a diameter of two feet.

Range: Northern part of North America.

Soil and location: Inhabits low, swampy lands; in the State of Maine often forming thick forests.

Enemies: Very seldom affected by insects.

Value for planting: Is hardy in New England, where it is especially used for hedges. It is also frequently used as a specimen tree on the lawn.

Commercial value: The wood is durable for posts, ties, and shingles. The bark contains considerable tannin and the juices from the tree have a medicinal value.

Other characters: The fruit is a cone about ½ inch long.

Other common names: Arbor-vitae is sometimes called white cedar and cedar.

Comparisons: The arbor-vitae is apt to be confused with the true white cedar (Chamæcyparis thyoides) but the leaves of the latter are sharp-pointed and not flattened or fan-shaped.

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