Long-petaled lewisia is a low-growing perennial plant in the Purslane (Portulaceae) family. The species has pale pink flowers and fleshy leaves and grows at high elevations (7,874 to 12,500 feet) in moist, rocky habitats directly below persistent snowfields. The worldwide distribution of long-petaled lewisia is limited to 16 element occurrences in the northern Sierra Nevada crest in El Dorado, Nevada, and Placer Counties, California. Within the Lake Tahoe Region the species is found in five populations consisting of 12 subpopulations and approximately 11,000 individual plants. As a snowbank obligate species, long-petaled lewisia is especially threatened by reduced snowpack in a warming climate. Most populations of long-petaled lewisia occur in remote, off-trail areas in designated wilderness; thus direct impacts from human activities are relatively low. Human activities that pose direct threats include recreational activities that might trample or uproot plants (e.g., camping, hiking, equestrian use, trail construction, snowmobiles), horticultural collecting, and road construction that might alter hydrology and degrade habitat. Long-petaled lewisia is monitored by the USDA Forest Service.