A great number of trees and shrubs are at the disposal of the landscape gardener. He has at his command all kinds and types of plants, and by proper selections he can obtain any desired effect. Our native flora, which is rich in variety of material, has been supplemented to a great extent by the additional of many new things of great value. These new things have come from two sources, the hybridizer and from other countries. The hybridizer has given us new horticultural species and numberless new varieties; but the largest increase has come through the introduction of the native flora of other countries.