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Uva, Richard; Neal, Joseph; DiTomasso, Joseph. Weeds of the Northeast. 1st ed. Ithaca, NY: Cornell University Press, 1997.
Kaufman, Sylvan Ramsey. Invasive Plants: a guide to identification and the impacts and control of common North American species. 1st ed. Mechanicsburg, PA: Stackpole Books, 2007.
Bryson, Charles; DeFelice, Michael. Weeds of the South. 1st ed. Athens, GA: University of Georgia Press, 2009.
Alienweeds: The Invasive Species Harvest
Cornell University, Weed Ecology and Management Laboratory
DOE Joint Genome Institute
Dr. Duke's Phytochemical and Ethnobotanical Databases
Food and Agriculture Organization of the United Nations, Plant Production and Protection Division
Germplasm Resources Information Network (GRIN)
Invasive Plant Atlas of New England, Department of Ecology & Evolutionary Biology, University of Connecticut, Storrs, CT
Invasive Plant Atlas of the United States
Jepson Flora Project, University of California, Berkeley
Jstor Plant Science
Kew Royal Botanic Gardens, kew.org
Lady Bird Johnson Wildflower Center, Native Plant Database, University of Texas at Austin
Maryland Invasive Species Council
Native American Ethnobotany, University of Michigan - Dearborn
Pacific Island Ecosystems at Risk, Institute for Pacific Islands Forestry
Plant Resources of Tropical Africa, Protabase
Plants For a Future: 7000 Edible, Medicinal, and Useful Plants
Robert W. Freckmann Herbarium, University of Wisconsin, Stevens Point
Rutgers University, Agricultural Experiment Station, New Jersey Weed Gallery
Southeast Exotic Pest Plant Council
Urban Herbs, Medicinal Plants at Georgetown University
US Forest Service, Invasive Plants List
USDA, NRCS. 2011. The PLANTS Database, National Plant Data Center
Weed Science Society of America
Wild Edibles mobile app
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