Top looks like evening primrose, oenothera.

Onothera missouriensis. I think.Been growing it for years.It sprawls along the ground and can smother smaller plants close by.I just cut mine back.It's very tough and long lived and loves growing in sandy soil.The only time I ever lost one was when I had a vole explosion and they dug down and ate the fleshy roots. I like it a lot,just wish it didn't sprawl so far.Beautiful lemon yellow,large flowers. I usually remove the large milkweed- like seedpods.Do'nt have room for more than one.If it doesn't have a prostrate habit then it's a closely related species. I think the second plant is Rose Campion too.

Unfortunately I do not know what the first plant is but it cannot be an Oenothera since they have 4 stigma and the above pictured plant has 5.

I don't have a clue. The leaves seem more fuzzy and not as glossy as Onothera missouriensis,but the red coloring is similar.Was it growing near a nuclear reactor? Convergent evolution? Hibiscus?

Maybe a couple of photos of other flowers would help.

Although I'm not close to one, I'm starting to consider the nuclear reactor comment seriously!

I'm looking at the picture and counting 4 stigma. The stigma is that cross shaped thing that sticks out the farthest.Update,when I made this comment I was scrolling up to look at the photo again and was thrown off by the second set of pictures.In these the flowers did have 4 stigmas.The flower in the original photo did have 5 stigmas.

Look at the pics above!

5 stamins,4 stigmas.

An onothera,macrocarpa, or a closely related evening primrose.

I was looking at the second set of photos when I counted 4 stigmas.The original photo seems to show 5.I did some reading and found out that in Onothera species the number of stigmas is always the same as the number of carpels, which is almost always 4,but that sometimes the number of carpels can be 2 or 5. I guess that explains why the flower in the original pic has 5 stigmas.It's not because of radiation,but instead variation.Sometimes things don't make sense because we/I don't have all the information.

Yes it would have to have been an evening primrose but for starters the plant habit is wrong for O. macrocarpa (O. missouriensis). So it's another kind of evening primrose.

Yeah, I did say the leaf texture seemed different from O.macrocarpa, and that it could be some other closely related species.What other growth habits have you found that don't line up with O.macrocarpa, and in your research have you found a better candidate for a posative I'd to Javier's photo?