APHIS (Animal and Plant Health Inspection Service, USDA) California Department of Pesticide Regulation Canadian Poisonous Plants Information System CSREES (Cooperative State Research, Education, and Extension Service, USDA) 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 Plants Database, USDA-NRCS USDA USDA-ARS