What is maddening is that my neighbor has one. She has no idea what it is, thinks it's a Chinese peony or something like that. She bought hers in Alaska for $25 and thought that was a horrible price. Sigh.
Thanks so much for all the information. I think I may wait a bit till I'm sure I have a place to plant one where it will survive. My garden is surrounded by sub-irrigated fields and things have been known to get just a tad soggy except for a few places higher up. Maybe a large, somewhat taller raised bed in one of the higher, drier places would work. Any thoughts on suitable companion plants?