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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..

Dr. Scott Russell's Botanical Links - Variety of informative, up-to-date, plant-related links from the Univ. of Oklahoma..

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..

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..

Internet Directory for Botany: Algae, Bryophytes, Fungi - links to many interesting sites in lower plants, e.g. algae, bryophytes and fungi..

MBG: W3TROPICOS - Database of plant names, information on them, and the sources of information..

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..

Schoolhouse: Science: Botany Resources - A list of links related to various aspects of botany..

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..

World-Wide Web Virtual Library: Botany - Collection of scholarly and research links for plant biology..