Here is a shot of the only two flowers I've ever seen

Passion flower (passiflora). Possibly Passiflora incense?

From Wikipedia:

Passiflora, known also as the passion flowers or passion vines, is a genus of about 500 species of flowering plants, the namesakes of the family Passifloraceae. They are mostly vines, with some being shrubs, and a few species being herbaceous.

Here is a link that might be useful: For your viewing pleasure :-)

not only is passionflower beautiful it is good herbal medicine! cultivated varieties come in a range of colors too.

Host plants for gulf fritillary butterfly caterpillars.

This one looks like the common passion vine we call Maypop. It grows wild along fence rows. The fruit can be eaten when it turns yellow.

If it is Maypop, that would make it Passiflora incarnata. Which is what it looks like to me.

The Passion Flower story is very interesting, here's a link to it, and the descriptions of the parts and their meaning.

Here is a link that might be useful: passion flower story

You can grow it from cuttings, and it puts out runners that grow in other parts of the yard, so maybe he could get cuttings from the customer, or dig up one that's come up from the runners. The Gulf fritillary butterfly eats the leaves, so that would be a bonus.

Here is a link that might be useful: Gulf Flitillary Butterfly

I want to thank you all for the help. Of course it's a passion flower! I can't believe I missed that one - duh! You know, I just started getting back into plants after about a 25 year hiatus, so I'm a little rusty. Working, raising children and that thing called living life just took precedence. Thanks to this wonderful web site, I am able to enjoy my plants instead of struggling because of lack of knowledge. Thank you to all that share their knowledge and expertise with amateurs like me :-)

I have one very prolific grower,also can get fruit.

Also the host plant to the Zebra Longwing Butterfly

I also think it's Passiflora 'Incense'.