Flora of North America : North of Mexico; Volume 9: Magnoliophyta: Picramniaceae to Rosaceae

To be published in 30 volumes,Flora of North America represents the first and only comprehensive taxonomic guide to the extraordinary diversity of plant life blanketing our continent north of Mexico. The collaborative effort of more than 30 major U.S. and Canadian botanical institutions, this ground-breaking scholarly series revises and synthesizes literally thousands of floristic monographs and regional floras published over the last three centuries.