PROTECTION STATUS: Endangered
YEAR LISTED: 1998
CRITICAL HABITAT: None
RECOVERY PLAN: None
RANGE: Western Riverside County, California
THREATS: Increased urbanization, agricultural disking, off-road vehicle use, alteration of hydrology, trampling by livestock, manure and sludge dumping, and competition from nonnative species
POPULATION TREND: The San Jacinto Valley crownscale experienced a severe decline between 1992 and 1999, when it lost 70 percent of its population, unfortunately a trend that continues today. The four remaining populations are located in the San Jacinto Wildlife Area, the floodplain of the San Jacinto River, the Upper Salt Creek vernal pool, and Alberhill Creek. Because floodwaters carry crownscale seeds over long distances, population ranges may shift from year to year.