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The National Capitol Columns originally supported the old East Portico of the United States Capitol (1828). The columns were removed during expansion of the Capitol in 1958.

The United States National Arboretum is an arboretum in Washington, D.C., operated by the United States Department of Agriculture's Agricultural Research Service as a division of the Henry A. Wallace Beltsville Agricultural Research Center. It was established in 1927 by an act of Congress.

It is 1.78 km² (446 acres) in size, and is located 3.5 km (2.2 miles) northeast of the Capitol, with entrances on New York Avenue and R Street. Nine miles of roadways wind through and connect the numerous gardens and collections on the 446-acre campus.

The arboretum acts as a major center of botanical research. It conducts wide-ranging basic and developmental research on trees, shrubs, turf, and floral plants. It has a library with 10,000 volumes and approximately 90 publications concentrating in botanical literature.

Bonsai persimmon from the National Bonsai and Penjing Museum presented to President Reagan by the King of Morocco in 1983

• Asian Collections, Japanese Woodland, Asian Valley, China Valley, Korean Hillside
• Azalea Collections, Glenn Dale Azalea Hillside, Morrison Garden, Lee Garden
• Dogwood Collections, Dogwoods, Anacostia River Overlook
• Fern Valley, Fern Valley Woodland, Prairie, Southeastern Coastal Plain
• The Friendship Garden, Arbor House: Gift Shop, Friends of the National Arboretum Office, National Bonsai Foundation Office
• Gotelli Dwarf and Slow Growing Conifer Collection, Gotelli & Watnong Collections, Spruces, Firs, Japanese Maples
• Holly and Magnolia Collections
• National Bonsai and Penjing Museum, Japanese, Chinese, North American, and International Pavilions
• National Boxwood Collection
• National Capitol Columns (see image above)
• National Grove of State Trees, specimens of most of the U.S. State trees.
• National Herb Garden, Historic Roses, Knot Garden, Specialty Gardens
• Perennial Collections, Peonies, Irises, Daylilies
• Classical Chinese Garden (proposed), a new 12-acre garden designed by a joint team from China and the United States.

• List of botanical gardens in the United States
• North American Plant Collections Consortium

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United States National Arboretum

• United States National Arboretum. Retrieved on November 23, 2005.
• Friends of the National Arboretum

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