• 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.

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