Camissonia graciliflora

HILL SUN CUP

Onagraceae
Evening Primrose family

© Jim Shevock

Annual. 
Open or shrubby slopes, generally clay soils, grasslands, and oak woodlands.
March–May 
< 2650' (800 m)
A Flora of Southern California p. 597
The Jepson Manual p. 782 785