No clue but I found this while doing an invasive species search on google images. http://www.fgcupinnacle.com/pinnacle-articles/features/invasive-plants
Hope you find your answer from some smart dude or Judy.
My brother-in-law decided he would give his backyard grass a treat. Having been a farmer he knew bull manure should be really good for the soil. After spreading it all around liberally and putting out fresh grass seed he watered and watched his creation blossom. The bull manure had come from Home Depot in big bags, maybe in the fine print their was the notice "may contain a billion weed seeds"? Being so disgusted with the weeds he tried his best to nuke the whole backyard.
would make sense if it's growing under an evergreen (acidic soil), depending on the amount of sun it gets.
may also be in this family:
though i don't know what/if any species has naturalized in your area.
disclaimer: these are just some wild guesses so i wouldn't take it to the seed bank just yet.
There is a quick easy way to tell the difference between soapwort and catchfly. Check the veins in the leaves. That the OP can do easily enough. Take a leaf and turn it over. Do all the veins go back to the base of the leaf in a single spot with sort of a 1/2 moon crescent and no branching?? Or do they attach to the main vein in multiple spots? The top pic is catchfly, the bottom is soapwort leaves.
Alder Burns wrote:Looks more like soapwort or bouncing-bet (Saponaria officinalis) to me. The blooms are fragrant at night, and if you crush up the plant in water it will produce a soapy lather and can be used as such.....
Wow, I thought for sure after you checked the veins in the leaves Alder had it! Now I guess I need to dig into my plant books deeper. A soapwort that doesn't soap...hmmmmmm
Vera Stewart wrote:Hmm. So I stuck my nose into these plants last night and got...nothing.
Then I mashed them up and boiled them to see if they would give me something approaching a soapy lather, and got..green water.
So, now they're back to being mystery plants!