Strybing Arboretum, Golden Gate Park, SF
Cellphone photo technology improves!
Here's a Passiflora "Passion Flower". There's a rather interesting story that involves Christian religious interpretation and the Passion Flower (crown of thorns, apostles, wounds, etc., as they correspond to the showy flower parts). You can read it here or here; Wikipedia's entry on Passion Flower, under the heading Etymology gives further detail.