Family: Campanulaceae (BELLFLOWER).
Other common names: San Gabriel bluecup.
Generic common name: BLUECUP.
NPS lands west of Malibu State Park: oak woodland, May 2005.
Characteristics: Native, Blue, Small, Solitary, Simple, Herbaceous, Annual, Early Spring, Late Spring.
This collection of images likely has both G. diffusa ssp. diffusa and ssp. robusta.