I believe it's Mirabilis jalapa, 4 o'clocks.

I think what I thought was milkweed syriaca (sp) is actually dogbane. I have a growing stand of it way in the back that I've let go for the past two years. It showed up on its own, and if it is dogbane, I'm going to yank it, dig it, destroy it this year. I'm trying to remember what the seed heads looked like, but I'm drawing a blank. I do remember getting the tent caterpillars on them last year, and I've read the dogbanes will get those. So, in answer to your question, that's the only experience I've had with it, and I don't want it to continue. LOL.

The flower bunch on a false solomon's seal would seem like a hyacinth flower to me. What exactly do you mean by that, then? Are leaves arraged opposite of each other, or alternate? Is it single stems from the ground, or branched stems? Are you hinting that they look somewhat like an astilbe? How many petals per flower? Does it grow in sun or shade? Are stems stiff, straight and vertical? Or arching?

Resembles Spring Phlox to me. What do the flowers look like? Are yours spreading or are you just reading about Dame's rockets and thinking that that is what you have? Phlox does spread easily but no where as much as DRs.