- CalFlora Database - - provides access to information about all 8375 currently recognized plants in California, including more than 670,000 plant observations and 20,000 photographs.
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- International Organization for Plant Information - - Manages a series of cooperative international projects that aim to create plant taxonomic information databases; also includes useful general botanical links - commissioned by the International Union of Biological Sciences.
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- Internet Directory for Botany - - an index to botanical information available on the Internet. It consists of two parts, an alphabetical directory and a categorical directory.
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- MBG: W3TROPICOS - - Database of plant names, information on them, and the sources of information.
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- Plants For a Future - - A resource centre for rare and unusual plants, particularly those which have edible, medicinal or other uses. The site contains an online database of over 7000 plants.
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- USDA PLANTS Database - - Plant names, photos, fact sheets, and information on culturally significant plants, noxious and invasive plants, and threatened and endangered plants, with links to thousands of plant-related sites and software tools.
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