Have been searching everywhere for them (oenothera triloba). Have moved, brought seeds with from my plants, planted them, and they became victims of chicken sabotage. I don't have anything to swap, as I'm just starting here. Willing to pay a fair price for seed or even seedlings. Have always enjoyed watching them open in the evening since I was a child.
I have plenty of seed if you are still looking for a source. I've grown these here in St. Louis for the past 5 years. Let me know ASAP.