Another note I wanted to add since I see it often, when submitting a URL link to show evidence of a plant proposal, make sure you check a few links in your search so that you are getting the correct full info. So many vendors don't add all the info but usually (not always) plant breeders do.
For instance, if you see several plants from the same vendor/nursery all starting with the same name as in a series, try to find the actual breeder as in most cases the series name will have a trademark ™ attached to it.