Mickey Corley's unknown in her words:
Can anyone give me a clue as to what iris this might be? This iris appeared in my flower bed 3 years ago. I had never seen it before nor can I find a description that fits it. It is of medium height and the coloring of the standards are slightly lighter - almost white than shown in the photo. This would be an older iris.

I know the names and descriptions (not perfect) of all the iris I've had
so perhaps I can match this to something I know I should have.