species in 122 genera classified in 29 families. Among the families treated in this volume, the largest are Euphorbiaceae (259 species), Rhamnaceae (105), Loasaceae (94), Linaceae (52), Oxalidaceae (36), Celastraceae (34), Vitaceae (30), Hydrangeaceae (25), Phyllanthaceae (23), and Cornaceae (20). Descriptions for all of the families, genera, and species (plus infraspecies, if recognized) are provided plus occurrence maps for species and infraspecies are included with more than 27% of the species illustrated. Keys are included to aid in the identification of genera in families and species plus infraspecies within the genera. Volume 12 is the twentieth volume to be published in the planned 30-volume Flora of North America North of Mexico series.

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