Resources
Regional
- California Flora Database
- Colorado Native Plant Society
- Colorado Natural Heritage Program
- Colorado State University Herbarium
- Mountain-Plains Museums Association
- University of California at Berkeley Herbarium & Jepson Herbarium
- University of New Mexico Herbarium
- University of Wyoming - Rocky Mountain Herbarium
National
- American Fern Society
- American Museum of Natural History - Center for Biodiversity and Conservation
- American Society of Plant Taxonomists
- Botanical Society of America
- Center for Plant Conservation
- Harvard University Herbaria
- Missouri Botanical Garden
- New York Botanical Garden
- USDA Animal and Plant Health Inspection Service
- USDA PLANTS National Database
Other Resources
- Botanic Gardens Conservation International
- Celebrating Wildflowers
- Dictionary of Botanical Epithets
- International Code of Botanical Nomenclature
- International Plant Names Index
- Natural Science Collections Alliance (formerly: Association of Systematics Collections)
- NatureServe
- Royal Botanic Garden Edinburgh
- Royal Botanic Gardens, Kew
- Royal Botanic Gardens Sydney