- About.com: Botany - A page of links and articles.
- Bioversity International - Provides information, publications and news on a range of subjects including agricultural ecosystems, genebanks, germplasm collection, crop wild relatives and neglected and underutilized species.
- Botanical Authors Database - Search the database of authors who contributed to the contents of the catalog of type specimens in the Harvard University Herbaria.
- Botanical Publications Database - Database of publications used to verify the entry of publication names in the Harvard Herbaria catalog.
- Botanical Society of America Image Collection - Collection of 14 sets of educational images for instructional use, with search capability.
- Botany Encyclopedia - Includes a botanical dictionary, advice for gardeners, and a store selling plants.
- Botresearch USA - a botanical research and biotechnology organization specializing in tissue culture, photomicroscopy, and the production of educational materials for universities.
- Center for Plant Conservation - Collaborative organization dedicated to conserving and restoring the rare native plants of the United States. Includes information on conservation techniques.
- Glossary of Botanical Terms - Contains more than 2,500 terms relating to botany, gardening, horticulture and landscape architecture. Fully searchable and it is regularly updated.
- Green Plant Phylogeny - Green plant phylogeny research coordination group.
- Hunt Institute for Botanical Documentation - A division of Carnegie Mellon University. Archives, research, art, and information about the institute are included.
- Institute for Plant Ecology - Information about research and teaching activities with focus on biodiversity and ecophysiology in different climatic regions, based at the University Münster.
- International Centre for Research and Training on Seabuckthorn - Information on the biology of this plant and its uses for environmental, economic, nutritional, and medical purposes; emphasizing erosion control.
- Max Planck Institute for Plant Breeding Research - Conducts research programs on molecular-biological, genetical, biochemical, physiological and cytological aspects of plant development and plant breeding. [English and German versions available.]
- Plant Tissue Culture Information Exchange - Intended to give researchers, teachers and producers rapid access to information about plant tissue culture.
- Suite101: Botany - Articles on a wide range of plant topics for teachers, students, amateur naturalists and general readers.
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