The maiden-hair tree (Salisburia adiantifolia) is a specially desirable tree from Japan and central Asia that does well over a large part of the Union. Even in southern Iowa it seems to thrive as well as in Georgia. The fern-like, half-tropical foliage is charming, as shown by a single specimen on the lawn.
The yellow-wood (Chionanthus Virginica) is another peculiar ornamental tree in its adaptation to varied soils and climates. It seems perfectly hardy on the prairies, yet it is not found native in severe climates in this country or Asia. It makes a handsome small tree with dark-green foliage and very showy white flowers.
Pliellodendron Amurense also has a wide range of adaptation. It is a success east and west of the lakes. Its thick, corky bark and elegant pinnate foliage three or four feet long gives variety to a tree group.
The horse-chestnut family is exceedingly varied, and some of its members are hardy over nearly the whole Union. In the East and Southwest the AEsculus hippocastanum, or white-flowered horse-chestnut, is extensively planted for street, avenue, and park trees. The double-flowered varieties are also much planted, also the red-flowered and other fine varieties and species. In the West the native type of AEsculus glabra is mainly planted, except south of the 40th parallel, where most of the European and native species and their varieties are hardy.
Fig. 93. - Yellow-wood (Cladastris tinctoria).
The beautiful nursery varieties and species of the beech can only be grown on granitic soils relatively free from lime as a rule. Where the blueberries, huckleberries, and cranberries succeed, the beeches can safely be planted. On the drift soils of the West they fail to thrive.
Some of the Desirable Evergreens.
At the North the word evergreen is applied to the cone-bearing trees with persistent foliage. The broad-leaved evergreens are mainly confined to the South.