Guide to the Plants of the Wallowa Mountains of Northeastern Oregon, first published in 1975, is acomprehensive flora of the botanically rich Wallowa Mountains of northeast Oregon. Introductory sections discuss the natural history of the Wallowa Mountains, and their geology, vegetation zones and botanical history. Keys to each family, genus, and species are provided, as are descriptions of each species. Small line drawings are provided for many of the plants included in the flora, as well as a glossary of botanical terms and an index to scientific and common names used in the text.

Author Georgia Mason (1910-2007) received a M.S. in General Science from Oregon State University in 1960. In the decade between 1961 and 1971, she spent the summer months botanizing alone in the rugged, isolated Wallowa Mountains. Mason was acting curator of the University of Oregon Herbarium in Eugene in 1961-1962, and again between 1970 and 1976. Following her retirement, she published her second book, Plants of Wet to Moist Habitats in and around Eugene, Oregon.