There are currently about 21 known populations of the plant remaining, and almost all of them have fewer than 20 individuals, with some with as few as 5 individual plants. As of 1989, the USDA estimated that fewer than 500 plants exist in total. The populations are scattered throughout the San Gabriel Mountains and the Peninsular Ranges in Los Angeles, San Bernardino, and Riverside Counties, its distribution possibly extending just into San Diego County. The USDA lists the plant as naturally occurring in Angeles National Forest and Cleveland National Forest. Naturally-occurring, extant populations can be found in Dripping Springs (near Aguanga), Scott Canyon, Agua Tibia Wilderness, and a large population in Vail Lake/Oak Mountain Area. The populations in Devil's Gate Dam, Arroyo Seco, the Rose Bowl, Rimforest, and San Timoteo appear to be introduced, according to a 2009 Southern California Edison Environmental Report for a renewable transmission line project in the Tehachapi Mountains. The same report states that plants in the San Francisquito canyon appear to be the only naturally regenerating population, despite having been introduced by seed.