International Plant Name Index
Provisional Global Plant Checklist (International Organization for Plant Information)
W3Tropicos (Missouri Botanical Garden)
Index Nominum Genericorum (Plantarum)
Vascular Plants Families and Genera, Kew
Vascular Plant Family Nomenclature
Dictionary of Botanical Epithets
International Code of Botanical Nomenclature (St. Louis Code)
Medzinárodný kód botanickej nomenklatúry (St. Louis Code) - slovenský překlad
Vascular Plant Types Catalogue - The New York Botanical Garden
Images of selected type specimens in JE (Herbarium Haussknechtianum)
Joseph F. Rock's Type Specimen Collections