Esh, I apologize. After posting this I completely forgot it, forgot to protect the green seed pods from the deer, forgot to harvest. Today I remembered. Apparently as the pods ripen they become less enticing to the deer, though, so there were a number left, and instead of the handful I was praying would be left, I'm pouring out hundreds of little flat seeds from each pod, picking them off my sweater and sweeping them up off the floor, helping to explain their gentle proliferation around outside so far. Although similar to formosanum in general, I don't think that can be it because I would have recognized that name when I got it and wouldn't be recalling it as some obscure species. Also, although lovely, it doesn't exactly knock a nice Formosa out of the ballpark, so I don't think someone would have been spreading an inferior selection with Vince Dooley's name attached to it. He's acquainted with a lot of plant collectors, too, and its route to me was through plant people. As is obvious, though, my memory is letting me down these days. In any case, thanks very much for answering. If anyone wants seed of an unidentified lily that is perfectly happy here in Georgia and prone to surprising with flowers waving overhead from unexpected places, just let me know. I have plenty of seed; and, although I can't provide the identity, I also didn't find any lilies on a Georgia invasive plants list.

Where are you? That info will be important in deciding ID. Also, IME many oak seedling leaves don't necessarily look exactly like those of more mature plants, so if you have other acorns or can clearly describe size, shape, and color pattern of the acorns or can take a photo of the tree the acorns came from, you may get a more certain ID. Also, simply trimming the original photo doesn't help. We can't see details and there are many, many species of oaks in the US (if that is where you are.) Yours appears to be in the red oak group (pointed leaf tips) though I can't be 100% sure from the photos with the light behind them, but that is still a lot of possibilities, so any additional information you can give will help.

M. nyctaginia was the native I was reffering to, Just forgot the name. Nice looking, but no kaleidoscope or broken colors. Miribilis is'nt hardy in my zone, but I have one on the south side, right against the house that gets enough heat radiation in winter to make it a perrenial.

R. cantabrigiensis. From Colvos Creek Nursery. Very bristley canes. Canes flexible and arching. Pale yellow flowers. Long bloom season (longest of all the once-blooming yellows in my garden). Still blooming today. Scented foliage (not strongly so, but unlike R. primula's scent) which surprised me. I have two plants of it--one in a sandy area of my garden and one in clay. The one in the sandy area is much bigger. R. cantabrigiensis next to a white/cream rambler on May 11, 2019