This may actually be a hybrid of the blue passion flower (Passiflora caerulea) with something else, as that plant is generally only marginally hardy here and this one is clearly doing well. But I’m not sure. It is growing a few blocks from our house and we saw the buds on in a while back so I wanted to come get some photos of the blooms. We pass it on our walks sometimes, depending on the route we take. It’s growing in a nice, sunny location on a mailbox and is covered with blooms.