Alpine Aster, Tundra Aster, Tundra Mountaincrown: Oreostemma alpigenum var. alpigenum (Synonym: Aster alpingenus ssp. alpigenus, Aster alpigenus var. alpigenus) - Found west of the Cascade Mountains in the Olympic Mountains and in the mountains near the California state border south of O'Brien, OR.
Anderson's Aster, Tundra Aster: Oreostemma alpigenum var. andersonii (Synonym: Aster alpigenus ssp. andersonii, Aster alpigenus var. andersonii, Aster andersonii, Erigeron andersonii) - Only found west of the Cascade Mountains in southwestern Oregon.