Lewisia sacajaweana is a species of flowering plant in the purslane family known by the common name Sacajawea's bitterroot. It is endemic to Idaho, where it is known from approximately two dozen sites, with about 75 percent of them in Boise National Forest. It is usually found at elevations ranging from 5,000 feet (1,500 m) to 9,500 feet (2,900 m) above sea level and produces white flowers shortly after snowmelt.