For more than 3 decades, John Kartesz and his talented staff have pursued the idealistic goal to have no less than all of the information on all of the North American vascular flora available in a single work. Already well-known for his major 2 volume work A Synonymized Checklist of the Vascular Flora of the United States, Canada, and Greenland, Dr. Kartesz and his colleagues have entered the electronic medium with a blockbuster, the only comprehensive source for the nomenclature and taxonomy for all known native and naturalized vascular plants (along with their synonyms, nearly 75,000 names) as well as distribution data and other useful information for the approximately 28,000 named taxa in North America north of Mexico (including Puerto Rico and Hawaii!). There is something for everybody in this Synthesis.