To my knowledge, there are no valid names for varieties of alata. Unlike flava, which have been divided into 7 varieties I believe. So with alata, you get a lot of made-up names for the same plant. You'll see nigrapurpurea, black/red, maroon throat, pubescens, etc..... Those are nothing more than nicknames and have no scientific basis. We just need someone to do a little research and see if these variations are significant enough to warrant varietal status (I would presume they would be), like Schnell did with S. flava.