Jim,

I have some Louisiana incarnata and Pennsylvania x Louisiana incarnata seeds that I could send you for postage. But you might try driving around within 50 miles or so of your location to see if you can find some roadside vines (wait until after noon to give the flowers a chance to open). They are more common than you might think. And vines seperated by more than 30 miles or so should be able to pollinate each other. You could dig one up, or take some cuttings (they will root, they just take a while).

Mark