(formerly Arenaria obtusiloba
) is a perennial alpine herb known by the common names alpine sandwort
and twinflower stitchwort
. It is native to the mountains of western North America from the High Sierra
of California to the Colorado Rockies
north to Alaska. Its range may extend into far eastern Russia. This is a low plant forming mats or clumps and bearing small thimble-shaped flowers with curving white petals.