Rayless Ragwort (Senecio aronicoides) is found in San Diego County, Orange County, Los Angeles County, Riverside County, Santa Barbara County, Contra Costa County, Santa Clara County, Santa Cruz Island, San Luis Obispo County, Solano County, Ventura County, Santa Rosa Island; Baja California, Mexico. It’s habitat is along the coastal sage scrub and is reported from cismontane woodland and alkaline flats.