My suggestion is to call the nursery and speak with their buyer. He/she'll know which supplier it came from, and either the buyer or the supplier should be able to tell you the variety. Also, the label might have the name of the supplier.
I have a Frederick passiflora, which is very common here in S. Calif. I don't have any flowers right now to compare, but your photos don't quite ring a bell. When you get some fruit, if they are purple that could be a passiflora edulis variety (Frederick, Purple Possum).
Go to etsy.com and search for passiflora, you'll find many photos of passiflora flowers. I see one named passiflora belotti that looks like your flower photos.