Gymnocalycium castellanosii var. bozsingianum (Schütz) Piltz variety synonym

Gymnocalycium castellanosii var. armillatum Piltz variety synonym

Gymnocalycium ferox (Backeb.) Slaba species synonym

Gymnocalycium ferox var. ferox variety accepted

Gymnocalycium castellanosii subsp. castellanosii subspecies accepted

Gymnocalycium mostii subsp. ferocius Backeb. ex H.Till & Amerh. subspecies synonym

Gymnocalycium hybopleurum var. ferox Backeb. variety synonym

Gymnocalycium ferox var. ferocius (Backeb.) Slaba, 1984 variety doubtful

Gymnocalycium castellanosii var. rigidum H.Till variety synonym

Gymnocalycium castellanosii subsp. ferocius (Backeb. ex H.Till & Amerh.) G.J.Charles subspecies accepted

Gymnocalycium castellanosii subsp. bozsingianum (Schütz) Amerh. & H.Till subspecies synonym

Gymnocalycium castellanosii subsp. armillatum (Piltz) Papsch subspecies synonym

Gymnocalycium bozsingianum Schütz species synonym

Gymnocalycium mostii subsp. ferocior Backeb. ex H.Till & Amerh. subspecies synonym

Gymnocalycium castellanosii subsp. ferocior (Backeb. ex H.Till & Amerh.) G.J.Charles subspecies accepted

Gymnocalycium mostii subsp. ferocius Backeb. subspecies homotypic synonym

Gymnocalycium mostii subsp. ferocior Backeb. subspecies homotypic synonym