This field guide is a tool for the identification of 119 common forbs found in the sagebrush rangelands and grasslands of the northern Great Basin. These forbs are important because they are either browsed directly by Greater Sage-grouse or support invertebrates that are also consumed by the birds. Species are arranged alphabetically by genus and species within families. Each species has a botanical description and one or more color photographs to assist the user. Most descriptions mention the importance of the plant and how it is used by Greater Sage-grouse. A glossary and indices with common and scientific names are provided to facilitate use of the guide. This guide is not intended to be either an inclusive list of species found in the northern Great Basin or a list of species used by Greater Sage-grouse; some other important genera are presented in an appendix.