Ritterocactus mueller-melchersii subsp. gutierrezii (W.R.Abraham) Doweld in Sukkulenty 2(2): 22. 1999
Ritterocactus mueller-melchersii subsp. gutierrezii in Sukkulenty 2(2): 22. 1999
is new combination for Notocactus gutierrezii in Kakteen And. Sukk. 39: 152. 1988