Let's have a weed here - Solanum nigrum. This is new to me, if you can imagine. Surely it's all over the place, and I've just never noticed it. It has the teeniest flowers, which I was excited to recognize as Solanaceae, so it wasn't hard to find the ID. It's growing in the very uncared-for landscaping right up against an apartment building two blocks from me, along with several other weeds, and some bigleaf maple seedlings.