Nice looking flower, do you know the hardiness of it? Passiflora incarnata, is native of the US and is hardy to zone 6. The fruit is edible but full of seeds. Although the quality isn't as good as the tropical varieties.

Yes I have seen Passiflora incarnata and very nice it is too. I don't think P.amethystina would be hardy in any part of the USA except Florida Keys or Hawaii as it has very thin stems and hardly any wood. You might like to look out for Passiflora coerulea which resembles incarnata but is more blue. This is very popular in Britain (Zone 8). This will stand quite low temps, but can be damaged by late frost, April or May, after it has restarted.

There's a cultivar called 'Amethyst' that's often confused with P. amethystina---the flowers are VERY similar, but the leaves and stipules are different. The difference is hard to describe, but very obvious once you've seen them both. 'Amethyst' has proven remarkably hardy for me---one survived last winter outdoors, sitting in a 4" pot! Last winter was a fairly mild one, but we are in Zone 7 and did have some nights below 20 degrees.

According to Vanderplank, there are approximately 460 species of this wonderful plant!