Database of 116,00 plant images, searchable by color, location, name, and photographer. Most photos are available for non-profit use. See usage and permissions page
elib.cs.berkeley.edu/photos/use.html for more information.
This site from Finnish herbalist, Henriette Kress, includes over 2700 plant images, organized by Latin name. For information on use of images, see "fine print" link:
Database of medicinal plant information from the Alternative Medicine Foundation. Individual plant pages include links to image sour
Includes over 14,000 images. Searchable by common or botanical name.
Plants Gallery - USDA Plants Database
Database of images of select US plants. Searchable by a variety of fields including common and scientific name, growth habit, and nativity status. See intellectual property statement link for information about commercial and educational/non-profit use of images.