Flora of North America represents the first and only comprehensive taxonomic guide to the extraordinary diversity of plant life in North America north of Mexico. The collaborative effort of more than 30 major U.S. and Canadian botanical institutions, this series revises and synthesizes literally thousands of floristic monographs and regional floras published over the last three centuries.Flora of North America North of Mexico Volume 14: Magnoliophyta: Gentianaceae to Hydroleaceae includes treatments prepared by 41 authors covering 624 species in 83 genera. Apocynaceae, Convolvulaceae, and Solanaceae, the largest families in the volume, contain many common ornamental plants and some widespread invasive species. They also contain plants used for food or medicine, yet some are highly toxic. Descriptions for all families, genera, species, and recognized infraspecies are provided, as are distribution maps for all species and infraspecies and many informative discussions. Every genus and 25% of the species are illustrated. Keys are included to aid in the identification of all genera, species, and infraspecies in the flora. Volume 14 is the twenty-fourth volume to be published in the planned 30-volume Flora of North America series.