Bartram's Garden

Bowman's Hill Wildflower Preserve in New Hope, Pa.

Evergreen Conservancy

Hunt Institute for Botanical Documentation

Indiana County Parks and Trails

Longwood Gardens

Marywood University Arboretum

Morris Arboretum at the University of Pennsylvania

Pennsylvania Department of Conservation and Natural Resources

Phipps Conservatory

Powdermill Nature Reserve

Scott Arboretum at Swarthmore College

Tyler Arboretum

Western Pennsylvania Conservancy

Outside of Pennsylvania

Arnold Arboretum

Atlanta Botanical Garden

Chadwick Arboretum and Learning Gardens at Ohio State University

Dawes Arboretum-Newark, Ohio

Holden Arboretum-Kirkland, Ohio

Mount Holyoke College Botanical Gardens

Nebraska Statewide Arboretum

New York Botanical Gardens

The Arboretum at the Barnes Foundation in Philadelphia

The Edith Johnson Carrier Arboretum-James Madison University

The Morton Arboretum-Nichols, Illinois

The Mountain Top Arboretum in Catskills Mountains

The JC Raulston Arboretum-NC State University

Trees and Shrubs of the Campus of Iowa State University

University of Nebraska-Lincoln Botanical Garden and Arboretum

University of Southern Maine Arboretum

Wildflowers and Trees of Western Pennsylvania

Miscellaneous Sites

American Chestnut Foundation

American Forest

American Public Gardens Association

Arbor Day Foundation

Botanical Society of America

Encyclopedia of Plants and Flowers

Ginkgo biloba Information

Gymnosperm Database

Internet Directory for Botany: Arboreta and Botanical Gardens

Plant Information Center

The United States National Arboretum-Washington, D.C.

What Tree Is It?

USDA Plants Database