I don't think it's a mutated Rhythm....style arms aren't colored the same. As far as all the blooms being affected...I would think, if it's the "growing point" on the rhizome that was exposed to the chemical (causing the mutation) all the blooms on that stalk would be affected.It does appear to be an "older" iris, but, again it's hard to say how much the "mutation" may have affected it's genetics....so a "throwback would , or could ,be possible...I would think. Good news is it *should* "grow out of it", next season. If it "DOSEN'T".....well, you have a "new" one to register, I guess !!
