- Angiosperm Phylogeny Website
- Angiosperm Phylogeny
- Anthos
- A Checklist of Family and Suprafamilial Names for Extant Vascular Plants
- Flora Iberica
- Flora Vascular
- GBIF in Spain
- Index Herbariorum
- Index Nominorum Genericorum
- Indices Nominum Supragenericorum Plantarum Vascularium
- International Code of Botanical Nomenclature
- List of system of Flowering Plants
- Optima
- PBIO 450 Lecture Notes
- The Complete Work of Charles Darwin Online
- The Euro+Med Plant Database
- The Families of Flowering Plants
- The information resource for Euro-Mediterranean plant diversity
- The International Plant Names Index
- The Linnaean Collections
- Tree of life project
- USDA - APHIS -- Concordance of Family Names
- Vascular Plant Families and Genera
