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Guy L. Nesom +
(Maguire ex Cronquist) S. L. Welsh +
Erigeron flagellaris var. trilobatus +
2200–3100 m +
Limestone cliff bases and faces, crevices, ledges, shelves, soil accumulations, talus, limestone gravel, lakeshores, bristlecone pine, spruce-fir-aspen, aspen, limber pine, Engelmann spruce +
Flowering Jul–Sep. +
Endemic +  and Conservation concern +
Erigeron proselyticus +
Erigeron sionis var. trilobatus +
Erigeron sionis +
variety +