It could be about anything... Including an unregistered seedling. If they don't specialize, there is also a good chance it is tissue cultured, if it is a named variety. My experience with TC has been that the colors, and plant habits don't match field grown divisions that were never TC'd. Maybe some do, but not the ones I have grown. I grew both at the same time to compare.
Personally, I don't think there is any way to really know what a no ID is, you are only guessing. IF it was really super distinctive, then maybe... But even then it is a guess.
