Well, I'm not really a good one to explain the differences, as I'm not sure I understand them, maybe some of the experts like
@KentPfeiffer should weigh in on this one, but I know if you go into the data base and search the plant specific data for irises, and scroll down far enough you can click on Emma Cook pattern, and there will come up all of the irises that are that pattern. Here's a couple of mine that I know are Emma Cook
Ring Of Fire and Revision
I really haven't learned the distinguishing characteristics of each yet. Maybe we can both learn.
