Glen you are correct, if a daylily is registered and described one way then it can't be shown another way.
In your example.......First, if the classification chair is doing their job (although things can be overlooked depending on how big the show is) then the bloom should never be placed in a section to begin with if it is registered as a single and it has a poly bloom that is brought in; it should go in a display only area.
If a daylily is registered as a single and it polys on the day of the show and you put it in the single section then it will either have points marked off or most likely it will just be marked judged meaning it was looked at it was not worthy of points because it was not showing what it was registered as. If it is put in the poly (double/poly section since there isn't just a poly section) section and the judges are aware that it is not registered as a poly it will be disqualified or marked as judged. Sometimes if the judges are not familiar with a daylily then it may get overlooked and they may assume it is in the right section and it is a poly. Since not very many people show polys in shows around here I have seen the judges ask for it to be looked up and make sure the bloom is indeed registered as a poly.
It's the same with single blooms that may have a double bloom, it can't be out in the double section or if the double isn't doubling on the day of the show then it can't be put in the single section. Whatever the registration says it is it where it is supposed to go.
