Jan I don't know the botanical name but it looks like Dame's Rocket to me. I googled a picture for you below.

Here is a link that might be useful: {{gwi:360651}}

Kabby, someone on Name That Plant forum ID'd it for me. It's a Money Plant. The leaves aren't like Dame's Rocket at all. Rosie gave me some seed last summer, but I never planted them. As it turned out, some of them planted themselves....lol. I don't think I've ever seen it growing before, but it's very pretty and likes shady areas. I've got a few other places I'm going to put it when it seeds for me. :)
Jan

Only difference I see from dames rocket is the leaves are not toothed like dames is.
Jill

Yep - that is it. Now remember, it is a biennial. If i remember correctly, it blooms one year and seeds the next - but don't hold me to it - latin name is lunaria. And Jan i have plenty more seeds if you need any! :) :)

Lunaria biennis....best known for the pretty seed pods. After the pods have dried (browned), remove the outside hulls, revealing the silvery, papery membrane inside. Cut the stems long for use in everlasting arrangements.

The attached link shows what they look like as they are maturing on the plant.

Here is a link that might be useful:

Use to see this all the time in Upstate NY, Syracuse. Always thought it was Phlox. Thanks to all of you, now I know what it is for real!