Hayden's Mountaincrown Aster
Oreostemma alpigenum var. haydeni (Porter) G.L. Nesom is native to Rocky slopes, talus, ridges, usually in alpine tundra, sometimes in clearings in pine-fir or pine-spruce woods, sometimes around lake edges or near snow banks in alpine habitats in eastern Oregon, Idaho, northern Nevada and northwestern Wyoming (Nesom 2006 FNA). The variety is distinguished by its linear-oblanceolate to narrowly oblanceolatebasal leaf blades and fruits that are only hairy on the upper portion of the fruit body. The variety has been reported to be diploid (2n=18).
The variety has been treated as Oreostemma alpigenum subsp. haydenii (Porter) Semple.