mofmof -
Just saw this today, noone has written you?
It does look like Lunaria or "Money Plant". Funny, someone had stored it in a box, guess they wanted to grow it for "future investment purposes".
Do you know of it? It has lovely purple-pink flowers, and shiny (when peeled)seed pods you see in dried arrangements, the plant can get weedy and over run places, but I just cut off the flowers where I don;t want them to spread!
Hope this helps. Let me know.
Best,
PP

I'm not sure. Could be a Datura? But I believe it is not illegal.