I hate to hear that about Sunset Serenade(or , any of them ,really !), as I was hoping the "verify" one of my Mother's iris....She always SAID it was "SS", and it LOOKS like "SS", but I wanted to "grow" one for comparison.
This also begs the question, in many cases, just WHICH one is the "imposter" ? The farther back in time you go, the muddier the water becomes !