Identification and Control
- CalPhoto (UC Berkeley)
- CDFA (California Dept. of Agriculture)
- Center for Invasive Plant Management
- Colorado Department of Agriculture
- The Colorado Environmental and Pesticide Education Program (CEPEP)
- CSU Extension
- E Flora BC – online herbarium from British Columbia
- Invaders Database System (University of Montana)
- Invasive.org
- Northeastern Area – USDA Forest Service
- Oregon State University
- PNW Weed Management Handbook
- USDA Plants Database
- USDA Weed & Pest Risk Assesments
- University of Wisconsin – Plant ID Tool
- Washington State Noxious Weed Control Board
- Weber County (Utah) Weed Abatement