Rabbitbrush is a common name for shrubs, principally of the western United States, in three related genera of the family Asteraceae:Chrysothamnus — about seven species in the United States, including Greene's rabbitbrush Ericameria — about six species in the United States, including gray and Parry's rabbitbrush Lorandersonia — about four species in the United States, including Bailey's rabbitbrush and spearleaf rabbitbrush