I have had this plant volunteer at my houses for probably more than 20 years. I do not know how or where it came from. When I moved it followed somehow. I did work at a Commercial Greenhouse many years ago and that is the only place I can think it might have come from. I pull it up but it always shows up.
After a meeting in Rockwall, I stopped briefly at Mallard Park in Lavon to look for penny-cress! :)
I am not confident about this ID, but it looks like the closest to what’s in my yard. Hopefully someone else can provide insight into this plant.