It's outrageous, I know. Nursery websites are not good sources of information.
I'd be surprised if anyone knows all of the species and subspecies. This is where I look them up:
http://www.theplantlist.org/tp...
This lists all of them and says whether they're accepted names, synonyms of other species names, or unresolved. You can see that "cinnicata" just plain doesn't exist.