I'm a little embarrassed, but the birds planted something new for me and I don't know what it is. ;P  I don't want it to spread in this area, but if it's useful I may transplant it elsewhere.  Does anyone have any idea what it could be?

Evening primrose, maybe?  https://en.wikipedia.org/wiki/Oenothera_biennis

I just looked it up and I think you're absolutely right.

That was embarrassingly simple.

Thank you.