Growing in an alley. Maybe P. caerulea?
Found near a grove of mostly Live Oaks and Escarpment cherries. Most likely a young plant, I think it is a young passion vine because there are other passion vines in the general area.
Pictured here are the leaves of a plant not yet in bloom. It is likely to be a passionflower but is hard to identify without the flower.
P pallida/suberosa