Yellow passionflower (Passiflora lutea) may be just as common in this area if not more so but due to it's small and inconspicuous flowers it just doesn't grab the attention of incarnata.
is a climber with loads of blue flowers and its now infested with butterfly larve.
The passion flowers or passion vines (Passiflora) are a genus of about 500 species of flowering plants, the namesakes of the family Passifloraceae. They are mostly vines, with some being shrubs, and a few species being herbaceous. For information about the fruit of the passiflora plant, see passionfruit. The monotypic genus Hollrungia seems to be inseparable from Passiflora, but further study is needed.