Species: 18.
Geography: Peru, Bolivia, Chile, Argentina.
- Maihuenopsis achiconoidea F. Ritter 1980 (Atacama, Chile)
= Opuntia achiconoidea (F. Ritter) D. R. Hunt 1997
- Maihuenopsis atacamensis (Philippi) F. Ritter 1980 (Atacama, Chile)
= Opuntia atacamensis Philippi 1860
= Pseudotephrocactus atacamensis (Philippi) Fric 1933
= Tephrocactus atacamensis (Philippi) Backeberg 1935
- Maihuenopsis bonnieae (D. J. Ferguson & R. Kiesling) E. F. Anderson 1999 (Catamarca, Argentina)
= Puna bonnieae D. J. Ferguson & R. Kiesling 1997
- Maihuenopsis comachoi (Espinosa) F. Ritter 1980 (Antofagasta, Chile)
= Opuntia comachoi Espinosa 1933
= Tephrocactus comachoi (Espinosa) Backeberg 1958
= Tephrocactus chilensis Backeberg 1953
= Opuntia chilensis (Backeberg) G. D. Rowley 1958
- Maihuenopsis clavarioides (Pfeiffer) E. F. Anderson 1999 (San Juan, Mendoza, Argentina)
= Opuntia clavarioides Pfeiffer 1837
= Cylindropuntia clavarioides (Pfeiffer) F. M. Knuth 1930
= Austrocylindropuntia clavarioides (Pfeiffer) Backeberg 1941
= Puna clavarioides (Pfeiffer) R. Kiesling 1982
- Maihuenopsis colorea (F. Ritter) F. Ritter 1980 (Atacama, Chile)
= Tephrocactus colorea F. Ritter 1963
= Opuntia colorea (F. Ritter) D. R. Hunt 1997
- Maihuenopsis crassispina F. Ritter 1980 (Atacama, Chile)
= Opuntia crassispina (F. Ritter) D. R. Hunt 1997
- Maihuenopsis darwinii (Henslow) F. Ritter 1980 (Santa Cruz, Argentina)
= Opuntia darwinii Henslow 1836-37
= Tephrocactus darwinii (Henslow) Fric 1934
= Opuntia platyacantha Pfeiffer 1837
= Tephrocactus platyacanthus (Pfeiffer) Lemaire 1868
= Opuntia hickenii Britton & Rose 1919
= Tephrocactus hickenii (Britton & Rose) Spegazzini 1926
= Opuntia neuquensis Borg 1937
= Tephrocactus neuquensis (Borg) Backeberg 1953
= Maihuenopsis neuquensis (Borg) F. Ritter 1980
= Maihuenopsis albomarginata F. Ritter 1980
- Maihuenopsis domeykoensis F. Ritter 1980 (Atacama, Chile))
= Opuntia domeykoensis (F. Ritter) D. R. Hunt 1997
- Maihuenopsis glomerata (Haworth) R. Kiesling 1980 (Jujuy, Argentina)
= Opuntia glomerata Haworth 1830
= Tephrocactus glomeratus (Haworth) Backeberg 1953
= Opuntia ovallei Gray 1847
= Tephrocactus ovallei (Gray) Backeberg 1958
= Maihuenopsis ovallei (Gray) F. Ritter 1980
= Maihuenopsis molfinoi Spegazzini 1925
= Opuntia molfinoi (Spegazzini) Werdermann 1931
= Opuntia leoncito Werdermann 1929
= Tephrocactus leoncito (Werdermann) Backeberg 1944
= Maihuenopsis leoncito (Werdermann) F. Ritter 1980
= Opuntia hypogaea Werdermann 1931
= Tephrocactus hypogaea (Werdermann) Backeberg 1935
= Maihuenopsis hypogaea (Werdermann) F. Ritter 1980
= Opuntia reicheana Espinosa 1940
= Tephrocactus reicheana (Espinosa) Backeberg 1958
= Tephrocactus conoideus F. Ritter ex Backeberg 1958 (non val. publ.)
= Opuntia conoidea (F. Ritter ex Backeberg) G. D. Rowley 1958 (non val. publ.)
= Maihuenopsis conoidea (F. Ritter ex Backeberg)F. Ritter 1980 (non val. publ.)
= Maihuenopsis leptoclada F. Ritter 1980
- Maihuenopsis grandiflora F. Ritter 1980 (Coquimbo, Chile)
= Opuntia llanos-de-huanta D. R. Hunt 1997
- Maihuenopsis minuta (Backeberg) R. Kiesling 1984 (northern Argentina)
= Tephrocactus minutus Backeberg 1935
= Opuntia minuta (Backeberg) A. Castellanos 1950
= Tephrocactus mandragora Backeberg 1953
= Opuntia mandragora (Backeberg) G. D. Rowley 1958
= Maihuenopsis mandragora (Backeberg) F. Ritter 1980
- Maihuenopsis nigrispina (K. Schumann) R. Kiesling 1984 (Bolivia, Argentina)
= Opuntia nigrispina K. Schumann 1898
= Tephrocactus nigrispinus (K. Schumann) Backeberg 1935
= Platyopuntia nigrispina (K. Schumann) F. Ritter 1980
= Tephrocactus atroglobosa Backeberg 1962 (non val. publ.)
= Platyopuntia atroglobosa (Backeberg) F. Ritter 1980 (non val. publ.)
= Opuntia atroglobosa (F. Ritter) R. Crook & Mottram 1995 (non val. publ.)
- Maihuenopsis ovata (Pfeiffer) F. Ritter 1980 (San Juan, Mendoza, Argentina)
= Opuntia ovata Pfeiffer 1837
= Pseudotephrocactus ovatus (Pfeiffer) Fric 1933
= Tephrocactus ovatus (Pfeiffer) Backeberg 1935 (non (Loudon) F. Ritter 1980 - T. aoracanthus)
- Maihuenopsis rahmeri (Philippi) F. Ritter 1980 (Trapacá, Chile)
= Opuntia rahmeri Philippi 1891
- Maihuenopsis subterranea (R. E. Fries) E. F. Anderson 1999 (northern Argentina, Potosí, Bolivia)
= Opuntia subterranea R. E. Fries 1905
= Pseudotephrocactus subterraneus (R. E. Fries) Kreuzinger 1935
= Tephrocactus subterraneus (R. E. Fries) Backeberg 1935
= Cumulopuntia subterranea (R. E. Fries) F. Ritter 1980
= Puna subterranea (R. E. Fries) R. Kiesling 1982
= Tephrocactus variflorus Backeberg 1962 (non val. publ.)
- Maihuenopsis trapacana (Philippi) F. Ritter 1980 (Trapacá, Chile)
= Opuntia trapacana Philippi 1891
= Tephrocactus trapacanus (Philippi) Backeberg 1935
- Maihuenopsis wagenknechtii F. Ritter 1980 (Coquimbo, Chile)
= Opuntia wagenknechtii (F. Ritter) D. R. Hunt 1997
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