Читать книгу Studies of Trees - Jacob Joshua Levison - Страница 29

Distinguishing characters: The terminal twigs are green, and the buds are round and small. Fig. 36.

Leaf: Has three to seven leaflets.

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.

Figure 36.—Twig of 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.