Colorado has a high diversity of willows (in the genus Salix) occurring from the alpine to the plains. This book describes 40 taxa (species, subspecies, & varieties) that occur in Colorado, covering native & non-native species, with color photographs of each, along with dichotomous keys to vegetative, floristic, and dormant material. The aim of this work is to enable students, restoration ecologists, researchers, land managers, and amateur and professional botanists to successfully identify willows. 10% of proceeds go to the Colorado Native Plant Society (CoNPS.org)