Have you considered Ginger which is a Schreiner's intro from the
1950's? I am at work now so I don't have a picture to send. We
have grown this iris in our family for a long time. It was the first iris
that came to mind when I saw your picture. It usually opens a little
darker but them quickly fades a bit in the sun to match what your picture was
showing. That is a t least it did that down in Texas. I just recently
received a piece of it from my mother and it will bloom for the first time( I
hope) here this spring.