Hmm, anybody else see the little flower on either side of the Ornithogalum in Stefan's picture up above? The beautiful drawing, I mean. There are the big Star of Bethlehems and then on either side of them is a smaller plant with nodding pinkish flowers kind of like Becky's.
On the drawing it says "Palma Christi" or something like that (wait, let me get my glasses . . . ) But when I googled Palma Christi plant it came up with Castor Bean.
It looks vaguely familiar but I don't know what it is either, sorry Becky. But I don't think it's terribly invasive since none of us have ever seen it. Is it possible that seeds or small bulbs came along with your daylily fans from somewhere else? They may have been in there a while, and not noticed until the flowers showed up. Did you get any other interesting "guest" plants in that load of dirt?