Years ago I used to be a bit of a Passiflora addict, I had many different ones as space allowed.
In the process, I picked up John Vanderplank's book "Passion Flowers". It is a great resource and list them alphabetically with comparisons of similar species. And yes, vitifolia is ruled out due to the different leaf shape.
Other reds are speciosa, leaves are also three-lobed. There is quadriglandulosa, the leaves are entire or asymmetrically three-lobed and quadrifaria with leaves which are entire margin serrate, or double serrate.
Other characteristics (besides bracts, which are also important) are the Corona filaments. Listed for coccinea, outer rank deep purple, and white or yellow at base. That also points to coccinea, as the others are different.
I would think if it is a species, coccinea fits.
thank you to Mr Vanderplank!
