NCBI Taxonomy Browser - A curated classification and nomenclature for all of the organisms in the public sequence databases from the National Center for Biotechnology Information, U.S. National Library of Medicine
Species 2000 - An autonomous federation of taxonomic database custodians collating a uniform and validated index to the world's known species (plants, animals, fungi and microbes).
Tree of Life - information about biodiversity, the characteristics of different groups of organisms, and their phylogeny
ECOTOX Database - Provides single chemical toxicity information for aquatic and terrestrial life.
Plants & Animals
E-Flora BC - A biogeographic atlas of the vascular plants (established and non-established), bryophytes, lichens, algae, fungi and slime molds of British Columbia. Includes a significant citizen science data component
Flora of North America - Information on the names, taxonomic relationships, continent-wide distributions, and morphological characteristics of all plants native and naturalized found in North America north of Mexico
International Code of Nomenclature for algae, fungi, and plants - Set of rules and recommendations that govern the scientific naming of all organisms traditionally treated as algae, fungi, or plants, whether fossil or non-fossil, including blue-green algae (Cyanobacteria), chytrids, oomycetes, slime moulds, and photosynthetic protists with their taxonomically related non-photosynthetic groups (but excluding Microsporidia). Before 2011 it was called the International Code of Botanical Nomenclature (ICBN).
International Plant Names Index (IPNI) - IPNI provides nomenclatural information (spelling, author, types and first place and date of publication) for the scientific names of Vascular Plants from Family down to infraspecific ranks.
