Here's a very old and incomplete list that often gets cited. Several should probably not be on it, for example P. rubra. A couple others would be found bad-tasting by many/most, for example P. herbertiana and P. caerulea. I think there may have been another list on this forum--I'll look for it.

The Ulmer, et al. book also describes which species are most frequently consumed, I think.

Here is a link that might be useful: list of edible Passiflora species

I'm sure the excerpt below constitutes copyright infringement, but will probably be overlooked if I mention the book is one well worth buying.

Here is a link that might be useful: Ulmer, et al. Passiflora book

How poisonous are they? I read even unripe fruit contains cyanide. Kinda scares me I bought one just for the fruit.