- About.com: Botany - A page of links and articles.
- Agriculture Knowledgebase - Source for information on topics related to agriculture, biotechnology and allied areas including plant breeding, genetics, seed technology and tissue culture.
- 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.
- 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.
- Hunt Institute for Botanical Documentation - A division of Carnegie Mellon University. Archives, research, art, and information about the institute are included.
- 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.
- Division Anthocerotophyta@ (31)
- Division Bryophyta@ (297)
- Division Coniferophyta@ (505)
- Division Cycadophyta@ (477)
- Division Equisetophyta@ (51)
- Division Ginkgophyta@ (14)
- Division Gnetophyta@ (22)
- Division Hepaticophyta@ (109)
- Division Lycopodiophyta@ (99)
- Division Magnoliophyta@ (10368)
- Division Polypodiophyta@ (532)
- Division Psilotophyta@ (28)