All the resources shown are free. When using them, be sure to give appropriate credit. For many topics, Wikipedia is an excellent resource. It is often my first stop when looking for information.

General resources

APGIV: An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV.

CoL: Catalogue of life. A taxonomic summary of all known organisms.

OneZoom: An interactive site for exploring the Tree of Life

GBIF: Global Biodiversity Information Facility: For global information =0-he distribution of biodiversity. The data come from different sources.

OpenHerbarium: A website that aggregates and displays specimen data from herbaria and provides “taxon pages” that provide information and images for individual taxa.

ICN: International Code of Nomenclature for algae, fungi, and plants.

ICN-CP: International Code of Nomenclature for cultivated plants.

POWO: Plants of the world online. A global resource that shows whether a name is “accepted”, meaning the editors of the resource considers that it is both nomenclaturally correct and that it represents a real taxon.

IPNI: International plant names index.

Index fungorum: List of names and synonyms of fungi.