I wonder if this is Winnipeggy. It "showed up" in my garden. I never purchased any lily under that name and there is no label where it came up. But several years ago I purchased On Wisconsin from the PNWLS and planted it in that general area (within inches, I would say). It wasn't doing well and I removed it to a pot on my front porch for recuperation.
From the Lily Register, I understand that On Wisconsin = Winnipeggy.