[floranorthamerica.org] Range, Habitat, Similarity to Other Species: Agrostis idahoensis grows in western North America, from British Columbia to California and New Mexico, in alpine and subalpine meadows along wet seepage areas and bogs, and in wet openings with Sphagnum in coniferous forests. It was recently discovered in Chile and Argentina; it is not known whether it is native or introduced there (Rugolo de Agrasar and Molina 1997). Agrostis idahoensis is often confused with A. mertensii (p. 644) and dwarf forms of A. scabra (p. 646), both of which tend to grow in better-drained habitats. (link added by Mary Ann Machi)