Acer negundo (Boxelder)
- Images of entire tree, bark, twig, leaf, flower, and fruit.
- http://www.cas.vanderbilt.edu/perl/bioview.pl?genspec=acne2&action=View

Acer negundo
- Includes distribution and occurrence, botanical and ecological characteristics, value and use, and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/aceneg/