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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.
National Tropical Botanical Garden is dedicated to preserving tropical plant diversity and stemming this tide of extinction - through plant exploration, propagation, habitat restoration, scientific research, and education.
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.