Gymnocalycium ferox (Backeb.) Slaba in Kaktusy (Brno) 20: 80. 1984 Gymnocalycium ferox (Backeb.) Slaba in Kaktusy (Brno) 20: 80. 1984is new combination for Gymnocalycium mostii subsp. ferocior Backeb. ex H.Till & Amerh. in Gymnocalycium 15: 435. 2002Taxon for this nameGymnocalycium ferox (Backeb.) Slaba