Iris Mutant or Sport
I believe this to be a sport or mutation of an Iris that has been in our family for decades. The name is unknown, but it is possibly Indian Chief based on pictures found American Iris Society’s Blog and on the Historic Iris Preservation website. It has the an odd coloration of only one standard that is divided into two colors. The bright color on the right half of the standard is new and looks bizarrely out of place.