"This book is exhaustive, accurate . . . One of its outstanding features is the 47 F. H. Round watercolors. Truly a great book." -- Tulsa Daily World. A legendary resource in the history of botanical literature, this volume comprises the life's work of the world's foremost authority on irises. Scholarly yet accessible, it converts the tangle of iris hybrids and varieties into clear, complete groupings and descriptions that form the modern classifications. Magnificent reproductions of 47 full-color paintings of irises by F. H. Round complement the text, along with 31 other illustrations.