Alabama
The University of Alabama in Huntsville Grounds and Arboretum (Huntsville, Alabama, USA). The site contains a comprehensive list of the more than 200 different trees located on the campus. Many are linked with descriptions and images of foliage, form, flower, etc.
Bellingrath Gardens and Home Alabama.
Huntsville-Madison County Botanical Garden

Alaska
The Arboretum at Flagstaff
Boyce Thompson Southwestern Arboretum
The Georgeson Botanical Garden Alaska. The Georgeson Botanical Garden is a research program dedicated to the propagation, cultivation and conservation of native and introduced plant species in the subarctic North. It is a repository for all ornamental and edible plant materials hardy in subarctic Alaska and a definitive source of horticultural information.

Arizona
Arizona Cactus Botanical Garden ,Bisbee, AZ
Desert Botanical Garden Phoenix. The Desert Botanical Garden, founded in 1937, is a living museum dedicatedto desert lands research and education.
Tucson Botanical Gardens Tucson, Arizona

Arkansas

California
California Arboretum Foundation - Arboretum News. CAF is a non-profit corporation benefitting the Arboretum of Los Angeles County, a 127-acre horticultural and botanical center for Southern California.
The Arboretum of Los Angeles County, USA.The mission of the Arboretum of Los Angeles County is to foster an awareness and appreciation of the role of plants in nature and in human affairs. This is accomplished through labelled plant collections, reference materials, and educational programs. The mission also includes preserving, displaying and interpreting historically important buildings and artifacts on the property.
Davis Arboretum, University of California
Pitzer College Arboretum
University of California, Santa Cruz Arboretum
The Wrigley Memorial and Botanical Gardens, Catalina Island, California
Crystal Hermitage Garden Nevada City
Rancho Santa Ana Botanic Garden, Claremont
Santa Barbara Botanic Garden

Colorado

Connecticut
The Bartlett Arboretum (University of Connecticutt, Stamford, USA) gives info on the history, gardens, collections and programs of the arboretum.
Connecticut College Arboretum, USA. The Connecticut College Arboretum is focused on native plants, wetland conservation, and energy conservation. The Arboretum offers a variety of different plant collections including; the Native Woody Plant Collection, the Caroline Black Garden and the Greenhouse Collection.
Highstead Arboretun (Redding
University of Connecticut, Greenhouses

Delaware

Florida
University of Central Florida Arboretum
John C. Gifford Arboretum, University of Miami
Fairchild Tropical Garden, Coral Gables, Florida
Harry P. LeuGardens has nearly fify acreas of peaceful grounds that ley you enjoy "Old Florida" at a leaisurely pace.
Mounts Botanical Garden, Florida, U.S.A. Located in West Palm Beach, Florida, Mounts Botanical Garden is thirteen acres of tropical and subtropical gardens. Collections of special note include tropical fruit, native plants, and bromeliads. Educational programs focus on tropical landscaping, environmental landscaping, landscaping for wildlife, and perennials for South Florida.

Georgia
Georgia Perimeter College Botanical Garden One of the largest collections of native plants in the Southeast.
State Botanical Garden of Georgia The State Botanical Garden of Georgia is a 313-acre horticultural preserve, featuring display gardens, a conservatory and five miles of nature trails.
Cecil B. Day Butterfly Center - Calloway Gardens, Pine Mountain, Georgia, USA
University of Georgia, Botany Department - Greenhouse Tour.

Hawaii
Lyon Arboretum, The Harold L. Lyon Arboretum, nestled deep in Manoa Valley is a unit of the University of Hawaii (USA), devoted to research, instruction and public service.
The Hawaii Botanical and Public Gardens
Tropical Gardens of Maui (Hawaii, USA). A 4 acre tropical garden and certified export nursery located on the island of Maui,

Idaho
Idaho State Arboretum ,Pocatello

Illinois
University of Illinois at Urbana-Champaign Arboretum
The Morton Arboretum, Lisle
Wilder Park Conservatory - Elmhurst Park, Elmhurst

Indiana
Hayes Regional Arboretum, Richmond, Indiana,
Warsaw Biblical Gardens, Mishawaka, Indiana

Iowa
Reiman Gardens, Iowa State University ,Ames
Cedar Valley Arboretum & Botanic Garden ,Waterloo

Kansas
Botanica, The Wichita Gardens ,Wichita

Kentucky
Bernheim Arboretum and Research Forest, Bullitt County, Kentucky

Louisiana
New Orleans Botanical Garden

Maine

Maryland

Massachusetts
Arnold Arboretum Jamaica Plain, Massachusetts, USA. The Arnold Arboretum is a collection of hardy trees, shrubs, and vines located on 265 acres in Boston, Massachusetts, USA. The grounds were planned and designed by the Arboretum's first director, Charles Sprague Sargent, in collaboration with the landscape architect, Frederick Law Olmsted.

Michigan
Huron County Nature Center, Wilderness Arboretum
Nichols Arboretum, University of Michigan, USA.
W.J. Beal Botanical Garden is one of the principal centers of plant interest within the arboretum-like campus of Michigan State University. More than 5,000 different kinds of plants can be found on the five-acre site.
Dow Gardens in Midland, Michigan. It is the former estate of Herbert H. Dow who founded the Dow Chemical Company.
Matthaei Botanical Gardens, University of Michigan (Ann Arbor

Minnesota
The Carleton Arboretum, Northfield
Gustavus Adolphus College, Saint Peter
University of Minnesota Landscape Arboretum, Chanhassen, MN, USA. The Arboretum maintains 14 display and specialty gardens, 60 generic collections, 5,000 species of plants, and 8 native environments on 905 acres.

Mississippi
Mynelle Gardens, Jackson

Missouri
Shaw Arboretum of the Missouri Botanical Garden, USA. Shaw Arboretum of the Missouri Botanical Garden includes four square miles of Ozark Border landscape and managed plant collections.
Missouri Botanical Garden

Montana

Nebraska
Concordia Arboretum - Concordia, College, Seward
Gilman Park Arboretum Pierce, Nebraska
Maxwell Arboretum, University of Nebraska-Lincoln
Nebraska Statewide Arboretum
D.A. Murphy Panhandle Arboretum, University of Nebraska
Pierce Arboretum, Nebraska, USA
University of Nebraska - Lincoln: Botanical Garden and Arboretum,
Wayne State College Arboretum Wayne

Nevada

New Hampshire

New Jersey
The Cora Hartshorn Arboretum and Bird Sanctuary, Short Hills
Holmdel Arboretum, Freehold

New Mexico
The Rio Grande Botanic Gardens and Conservatory Albuquerque

New York
Planting Fields Arboretum in Oyster Bay 409 acres with many different collections, one acre under glass, 70 room mansion, Synoptic garden, etc.
Cornell Plantations: the Arboretum, Botanical Garden, and Natural Areas of Cornell University
Brooklyn Botanic Garden, USA- This site contains information about the Brooklyn Botanic Garden's exhibits, publications, New York Metropolitan Flora Project, membership and games.
Clinton Community Garden
Sonnenberg Gardens, Canandaigua, NY, USA. A beautiful Victorian mansion and gardens, located at the foot of Canandaigua Lake, in the heart of the Finger Lakes Region in Upstate New York.

North Carolina
JC Raulston Arboretum Raleigh
North Carolina State University Arboretum
Daniel Stowe Botanical Garden, Belmont
The North Carolina Botanical Garden, USA. Made up of three tracts in Chapel Hill: the Coker Arboretum, the Mason Farm Biological Reserve, and the North Carolina Botanical Garden proper.

North Dakota

Ohio
Ohio State University Chadwick Arboretum (Columbus
The Dawes Arboretum (Newark Founded in 1929 by Beman and Bertie Dawes, The Dawes Arboretum includes 1,149 acres of plant collections and natural areas
Holden Arboretum, Kirtland, Ohio, USA. Located in Kirtland, Ohio, twenty five miles east of Cleveland, the Holden Arboretum encompasses over 3,100 acres and is the largest arboretum in the United States.
Ohio State University Chadwick Arboretum Columbus, Ohio, USA
Schedel Foundation Arboretum and Gardens, Elmore, Ohio, USA.
R.A. Stranahan Arboretum, University Of Toledo
Fellows Riverside Gardens, Youngstown

Oklahoma

Oregon
Palmerton Arboretum, Roger River
Mount Pisgah Arboretum, Eugene
Japanese Garden in Portland

Pennsylvania
American College Arboretum, Bryn Mawr
Chanticleer Garden Chanticleer is a 30-acre pleasure garden of ever-changing colors and textures. Stroll through a unique array of perennials, containers, tropical gardens, woodlands, and wildflowers. Philadelphia.
Morris Arboretum of the University of Pennsylvania
Tyler Arboretum Homepage (Media, Pennsylvania
Japanese House and Garden, Fairmount Park, Philadelphia, PA
Bartram Gardens, Philadelphia

Rhode Island

South Carolina
Riverbanks Zoo and Botanical Garden, Columbia
Magnolia Plantation and Its Gardens ,Charleston

South Dakota

Tennessee
Alfred B. Maclay State Gardens Tallahassee
Dixon Gallery and Gardens, Memphis, Tennessee, USA

Texas
The Riverside Nature Center in Kerrville, TX with over 100 native trees, wildflowers, grasses and shrubs and lots of wildlife.
The Stephen F. Austin State University Arboretum
The Arboretum of Victoria
Moody Gardens, Galveston Island, Texas.
Houston Arboretum and Nature Center,Texas
The Gardens Collabortive Gateway site to more than 20 public gardens and arboreta in the Philadelphia region, which boasts the largest concentration of public gardens in the United States.
San Antonio Botanical Gardens A 33 acre botanical garden in San Antonio, Texas. The Lucile Halsell Conservatory complex features plants from alpine regions to tropical rainforests. Collections are housed in underground environments including alpine, epiphyte, desert, insectivorous, hot tropical, palm, cycad, aroid, fern, fruit, and aquatic collections. The formal gardens include rose, formal, herb, old fashioned, Japanese, etc. A large area of the gardens is arranged into a regional plant exhibit for diverse regions across Texas, including examples of early architecture.
Zilker Botanical Garden ,Austin
The Fort Worth Botanical Garden Ft Worth

Utah
Red Butte Garden and Arboretum Salt Lake City, Utah, USA

Vermont:

Virginia
Blue Rideg Community College Arboretum Initiated in 1987 by Anne Nielsen, Associate Professor of Biology, and a group of college and community volunteers, the Blue Ridge Community College Arboretum is a living museum of native and naturalized plants from around the Commonwealth.
Edith Johnson Carrier Arboretum
James Madison University Arboretum, Harrisonburg
Boxerwoord Gardens (Lexington
Virginia Tech Horticulture Garden ,Blacksburg

Washington:
The United States National Arboretum - Washington D.C., USA
The National Garden, Washington D.C., USA
Washington Park Arboretum
Yakima Area Arboretum (Yakima, Washington, USA)
Meerkerk Rhododendron Gardens, USA. Located on beautiful Whidbey Island in Washington State's Puget Sound region, Meerkerk Gardens features mature rhododendron hybrids, rare and unusual rhododendron species, azaleas, spring bulbs and naturalized companion plantings in a peaceful woodland setting.
University of Washington, Medicinal Herb Garden

West Virginia
Core Arboretum, West Virginia University

Wisconsin
Boerner Botanical Gardens, Milwaukee
Paine Art Center & Arboretum, Oshkosh, Wisconsin
University of Wisconsin Arboretum, Madison, USA
Mitchell Park Horticultural Conservatory, Milwaukee
Rotary Gardens, Inc. ,Janesville

Wyoming
The Cheyenne Botanic Gardens