Species: ~ 17.
Geography: South America
- Frailea buenekeri W. R. Adams 1990 (Rio Grando do Sul, Brazil)
- Frailea buinigniana Prestlé 1997 (Rio Grando do Sul, Brazil)
- Frailea castanea Backeberg 1935 (southern Brazil, northern Uruguay)
- Frailea castanea subsp. harmoniana (F. Ritter) P. J. Braun & Esteves 1995 (Rio Grando do Sul, Brazil)
- Frailea cataphracta (Dams) Britton & Rose 1922 (Brazil, Bolivia, Paraguay)
- Frailea chiquitana Cárdenas 1951 (Cordilliera province, Santa Cruz, Bolivia)
- Frailea curvipina Bunining & Brederoo 1972 (Rio Grando do Sul, Brazil)
- Frailea friedrichii Bunining & G. Moser 1971 (Rio Grando do Sul, Brazil)
- Frailea gracillima (Monville) Britton & Rose 1922 (Paraguay, Brazil, Uruguay)
- Frailea grahliana (F. Haage) Britton & Rose 1922 (Paraguay, Argentina)
- Frailea knippeliana (Quehl) Britton & Rose 1922 (Paraguay)
- Frailea mammifera Bunining & Brederoo 1972 (north of Pedrito, Rio Grando do Sul, Brazil)
- Frailea perumbilicata F. Ritter 1970 (Rio Grando do Sul, Brazil)
- Frailea phaeodisca (Spegazzini) Y. Itô 1957 (Tacuarembó, Uruguay)
- Frailea pseudopulcherrima Fric ex Y. Itô 1957 (Uruguay)
- Frailea pumila (Lemaire) Britton & Rose 1922 (Uruguay, Paraguay, Brazil, Argentina)
- Frailea pygmaea (Spegazzini) Britton & Rose 1922 (Uruguay, Brazil, Argentina)
- Frailea schilinzkyana (F. Haage) Britton & Rose 1922 (Paraguay, Argentina)
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