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Botanical Society of America - Leading Plant Scientists and Educators Since 1893, plant science, research, education, outreach
The California Native Plant Society (CNPS) is a non-profit organization dedicated to the understanding and appreciation of California's native plants and to conserve them and their natural habitats through education, science, advocacy, horticulture and land stewardship.
Arizona Native Plant Society. Statewide nonprofit organization devoted to Arizona native plants; missions are education, conservation, and encouraging use of appropriate native plants in Arizona and the Southwest.