- APHIS (Animal and Plant Health Inspection Service, USDA)
- California Department of Pesticide Regulation
- Canadian Poisonous Plants Information System
- EPA Pesticide Topics
- Federal Interagency Committee for the Management of Noxious & Exotic Weeds, USDA
- IR-4 Project
- National Agricultural Library, USDA
- National Agricultural Statistics Service, USDA
- National Institute of Food and Agriculture, USDA
- Plants Database, USDA-NRCS
- USDA
- USDA-ARS
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