About Salix petrophila Rydb.
Salix petrophila Rydb., commonly known as alpine willow and Rocky Mountain willow, is a mountain shrub native to northwestern North America that belongs to the willow family, Salicaceae. This species grows in the subalpine and alpine zones of the Sierra Nevada range. It occurs in wetland habitats including moist banks and wet meadows, at elevations ranging from 9,900 to 13,000 feet (3,000 to 4,000 m).