Oreostemma is a genus of flowering plants in the daisy family, Asteraceae. Species are found in western North America, with two endemic to California. Species 1. \n* Oreostemma alpigenum (Tundra aster) — California, Nevada, Oregon, Washington, Idaho, Montana, Wyoming 2. \n* Oreostemma elatum (Plumas alpine aster) — Sierra Nevada, California 3. \n* Oreostemma peirsonii (Peirson's aster) — endemic to California, in the southern Sierra Nevada.