Miner's lettuce south of Hoffman Mountain.
San Diego County, California, US
I'm not sure of species. I couldn't list this simply as "genus Claytonia".
Location Beaver County Park Property. Found on sandy silt floodplain of Raccoon Creek. Plant in full bloom.
Claytonia (Spring Beauty) is a genus of 26 species of flowering plants in the family Montiaceae, primarily native to North America, with a few species extending south to Guatemala in Central America, and northwest to northeastern Asia.