Erigeron vagus is a high-elevation species of flowering plant in the daisy family known by the common names rambling fleabane. Erigeron vagus is native to the peaks of the western United States where it lives on talus slopes, sometimes above the tree line but other times in open coniferous forests. It has been found in several locations isolated from each other, in eastern California (Sierra Nevada and White Mountains), southern Utah, southern Colorado, northeastern Nevada (Elko County), and northeastern Oregon (Wallowa Mountains).