For many plants there is no registration authority for that genus. A publication of the name in a journal, such as the Cactus and Succulent Society or the Sedum Society, does confer on that cultivar an official status. We are in the same boat with Semps although the German site is close and a way to clear up naming issues.
When you do name, heed the rules of naming plants. You can check those on the American Iris Society website.
Kevin
