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- USDA Plants Database
- Johnson Wildflower Center Database
- CalPhotos: Plants
- Hortiplex Plants Database
- Wildflowers of Western Pennsylvania
- Delaware Wildflowers
- National Audubon Society Field Guid to North American Wildflowers, by John W. Thieret, William A. Niering, Nancy C. Olmstead
- A Field Guide to Wildflowers : Northeastern and North-Central North America (Peterson Field Guides), by Margaret McKenny and Roger Tory Peterson
- Newcomb's Wildflower Guide, by Lawrence Newcomb