Gymnocalycium cardenasianum f. armatum (F.Ritter) H.Till & Amerh. in Gymnocalycium 12: 308. 1999.

Nomenclatural References

• person : Friedrich Ritter (1898-1989) Based on occurrence of standard abbreviation 'F.Ritter' in the authors string.
• person : Hans Till (1920-2012) Based on occurrence of standard abbreviation 'H.Till' in the authors string.
• person : Helmut Amerhauser Based on occurrence of standard abbreviation 'Amerh.' in the authors string.
• database : The Plant List version 1.0, record: kew-2835569
• database : The Plant List version 1.1, record: kew-2835569