Index Nominum Genericorum (Plantarum) http://botany.si.edu/ing/The Index Nominum Genericorum (ING), a collaborative project of the International Association for Plant Taxonomy (IAPT) and the Smithsonian Institution, was initiated in 1954 as a compilation of generic names published for all organisms covered by the International Code of Botanical Nomenclature.
Plants National Database http://plants.usda.gov/The PLANTS Database is a single source of standardized information about plants. This database focuses on vascular plants, mosses, liverworts, hornworts, and lichens of the U.S. and its territories. The PLANTS Database includes names, checklists, automated tools, identification information, species abstracts, distributional data, crop information, plant symbols, plant growth data, plant materials information, plant links, references, and other plant information
Vascular Plant Families and Genera http://www.rbgkew.org.uk/web.dbs/vascplnt.htmlThe data presented here are taken from the publication
Vascular Plant Families and Genera compiled by R. K. Brummitt and published by the Royal Botanic Gardens, Kew in 1992.
Index to Organism Names (OIN) http://www.organismnames.com/The Index to Organism Names is a tool for biologists sponsored and hosted by
BIOSIS, incorporating name data from resources of BIOSIS and several other collaborating organizations. It is maintained in the UK by staff of the Zoological Record
Integrated Taxonomic Information System (ITIS) http://www.itis.gov/The Integrated Taxonomic Information System (ITIS) is a partnership of U.S., Canadian, and Mexican agencies, other organizations, and taxonomic specialists cooperating on the development of an on-line, scientifically credible, list of biological names focusing on the biota of North America.