Archaeobotany — Botanical Resources (Taxonomies, Nomenclatures)

A database of the names and associated basic bibliographical details of all seed plants, with data from three sources: the Royal Botanic Gardens' Index Kewensis, Harvard University's Gray Herbarium Index of New World Plant Names, and the Australian National Herbarium

The rules that govern the scientific naming of algae, fungi, and green plants are revised at Nomenclature Section meetings at successive International Botanical Congresses. [...] this edition of the Code embodies the decisions of the XVIII Congress in Melbourne in 2011. It supersedes the Vienna Code, published six years ago...

Index of the meanings of plant names

A compilation of generic names published for all organisms covered by the International Code of Botanical Nomenclature; A collaborative project of the International Association for Plant Taxonomy (IAPT) and the Smithsonian Institution

Easy-to-use index of native and naturalized plants in the US and its territories from the U.S. Department of Agriculture Natural Resources Conservation Service

A digitized version of a classic 1931 book on the "Medicinal, Culinary, Cosmetic and Economic Properties, Cultivation and Folk-Lore of Herbs." Includes descriptions of herbs and their uses, and indexes for recipes and poisons

Access to the Missouri Botanical Garden's VAST (VAScular Tropicos) nomenclatural database and associated authority files

Taxonomic data on nearly 60,000 species with images, bibliographic items and distributional records from the National University of Ireland