Interesting question, I assume that you are asking about the Hippeastrum varieties that are marketed now. I do know that all the Hadeco ones from South Africa have a circled R after the name, indicating that the name is registered (patented). That is to keep another grower from selling them under another name. I used to have a link for an official registry: I believe that it was in the Netherlands. The breeder submitted the description and name to this registry. This way, if you buy a bulb labeled as "Susan" you assume that it is the original registered Susan. I don't know if this dutch registry also lists the varieties developed in Japan and other places.
