This monumental classic of botany, unsurpassed as the most comprehensive and reliable work on the flora of the northern U.S. and Canada, supplies full botanical information for 4,666 species. Each plant is identified by its popular name as well as by Latin nomenclature. The two subkingdoms of ferns and seed-bearing plants are broken down into classes, orders, families, genera, species and race, with each species described and illustrated with remarkable clarity and detail.