Morton Arboretum
Morton Arboretum, an outdoor museum of trees, shrubs, and vines at Lisle, Illinois, 24 miles (39 km) west of downtown Chicago. The arboretum covers some 1,700 acres (690 hectares) and contains about 3,500 kinds of woody plants, arranged in ornamental plantings and in groups based on botanical relationships, natural habitat, and geographic origin. Special collections include hedges, dwarf shrubs, and ground cover.
Facilities include a library, herbarium, and lecture hall. Both research and educational activities are conducted. The arboretum was established in 1922 by Joy Morton, a businessman whose father, J. Sterling Morton, was the originator of Arbor Day. It is maintained by a private foundation.