Index Nominum Supragenericorum Plantarum Vascularium
James Reveal
Index Nominum Genericorum (Plantarum)
Names in Current Use: Genera
Plant Systematics Collection
University of Wisconsin, Minesota
Species 2000
indexing the world's known species
TAMU-BWG
Herbarium Specimen Browser
The International Plant Names Index (IPNI)
PBIO 450 Lecture Notes
James L. Reveal
W3TROPICOS
Nomenclatural database
Taxonomic Database Working Group
Land Plants online
PalDat - Palynological database
Department of Ultrastructure Research and Palynology, University of Vienna, Austria
ITIS - Integrated Taxonomic Information System