[Wikipedia] Range: It is native to high latitudes and high elevations in Eurasia and North America. In North America, it can be found in Alaska, Greenland, the Canadian Arctic, and the Rockies, Cascades, and Sierra Nevada as far south as Arizona and New Mexico.[4][5] In Eurasia, it is widespread across European and Asiatic Russia[6] and also grows in Scandinavia and in the mountains of central Europe (Carpathians, Alps, etc.). (link added by Mary Ann Machi)