Ritterocactus mammulosus subsp. erythracanthus (H.Schloss. & Brederoo) Doweld in Sukkulenty 2(2): 22. 1999
Ritterocactus mammulosus subsp. erythracanthus in Sukkulenty 2(2): 22. 1999
is new combination for Notocactus erythracanthus in Kakteen And. Sukk. 36: 189. 1985