- CalFlora Database
 - Contains geographic and ecological distribution information for California's plants. - HortiPlex
- Plant database containing images, gardening information, nomenclature data, and links.
- INVADERS Database System
- Comprehensive database of exotic plant names, distribution records, and regulatory information for the northwestern United States.
- Pennsylvania Flora Project
- Searchable database of Pennsylvania.
- Tropical Plant Database
- Providing information and education on the important plants of the Amazon rainforest.
- University of Connecticut Plant Database
- Dedicated to the ornamental attributes, appropriate use, and identification of landscape plants suitable for the Northeast and areas with similar climates. Features online virtual campus walks.
- USDA National PLANTS Database and Projects
- USDA provides standardized information about the vascular plants, mosses, liverworts, hornworts, and lichens of the U.S. and its territories.
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