It is all plenty confusing, that is why I use registers as my first resource. But that doesn't mean much when the dutch take a registered lily, give it another name and then register it as a different lily.
I have also seen where the dutch sell under a temporary name while they wait for approval of a registered name. I have seen this documented here and there in the RHS Lily Register. But for the most part, I suspect these tricks are not documented anywhere, at least not in registers we have access to. Makes for lots of fun...
Anyway, if we get photos of lilies that look exactly alike but different names I treat them as different until I find some sort of authoritative evidence that they are the same, then use additional cultivar names for database purposes. It gets kind of grueling at times.
