Gymnocalycium robustum
Gymnocalycium robustum in Cact. Succ. J. (Los Angeles) 74: 4. 2002 sec. Charles 20091 wfo-0000712662
- =Gymnocalycium kuehhasii in Gymnocalycium 21: 748. 2008 syn. sec. Charles 20092 wfo-0000509441
- =Gymnocalycium affine in Cact. Succ. J. (Los Angeles) 82: 261. 2011 ["2010"] syn. sec. Metzing 20213 wfo-0000749352
- 3. Metzing, D. 2021: Revisions of Frailea, Gymnocalycium and various other genera. – In: Korotkova N. & al., Cactaceae at Caryophyllales.org – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51: 251-270. https://doi.org/10.3372/wi.51.51208
- =Gymnocalycium campestre in Novon 24: 281. 2015 syn. sec. Metzing 20214 wfo-0001431046
- 4. Metzing, D. 2021: Revisions of Frailea, Gymnocalycium and various other genera. – In: Korotkova N. & al., Cactaceae at Caryophyllales.org – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51: 251-270. https://doi.org/10.3372/wi.51.51208
- =Gymnocalycium alenae in Schütziana 8(2): 28. 2017 syn. sec. Metzing 20215 wfo-0001431029
- 5. Metzing, D. 2021: Revisions of Frailea, Gymnocalycium and various other genera. – In: Korotkova N. & al., Cactaceae at Caryophyllales.org – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51: 251-270. https://doi.org/10.3372/wi.51.51208
- =Gymnocalycium kuehhasii subsp. corneispinum in Schütziana 10(2): 43. 2019 syn. sec. ??? wfo-0001303000
- =Gymnocalycium kuehhasii subsp. corneuspinum in Schütziana 10: 43. 2019 syn. sec. Metzing 20216 wfo-0001434815
- 6. Metzing, D. 2021: Revisions of Frailea, Gymnocalycium and various other genera. – In: Korotkova N. & al., Cactaceae at Caryophyllales.org – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51: 251-270. https://doi.org/10.3372/wi.51.51208
- =Gymnocalycium kuehhasii subsp. incurvatispinum in Schütziana 10: 43. 2019 syn. sec. Metzing 20217 wfo-0001434816
- ≡Gymnocalycium ×incurvatispinum in Gymnocalycium 32: 1341-1342. 2019 syn. sec. Metzing 20217 wfo-0001434792
- 7. Metzing, D. 2021: Revisions of Frailea, Gymnocalycium and various other genera. – In: Korotkova N. & al., Cactaceae at Caryophyllales.org – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51: 251-270. https://doi.org/10.3372/wi.51.51208