Ginge, I have no idea what it is, but... I had one find its way to my home in an orchid pot in 1990, it has self seeded into most of my other pots. Its so pretty I just let it come up where it lands, they will find their way to the other side of a room if you let them! Sometimes they make seeds with no visible flowers either. Enjoy it! By the way I have seen a purple variety with bronze leaves in the Brooklyn Botanical Garden, there was no label and no one to ask what it was.