Lilies: Don't know much about lilies, 1 by Windy

Windy wrote:
I have a lily in my yard and I have no idea where it came from.
Last year was the first time it appeared and it was about two feet tall. It made a nice bunch of seeds which I just tossed into a pot and forgot about. They actually germinated this spring and seems like they all are doing well, though not being looked after at all.
I wonder if anyone can identify this lily. It is taller than my six foot privacy fence.