| Frailea pygmaea (Speg.) Britton & Rose |
Accepted |
 |
WCSP (in review) |
|
| Frailea pygmaea subsp. albicolumnaris (F.Ritter) Hofacker |
Accepted |
 |
WCSP (in review) |
|
| Frailea pygmaea var. altigibbera F.Ritter |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea subsp. altigibbera (F.Ritter) P.J.Braun & Esteves |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea subsp. asperispina (F.Ritter) P.J.Braun & Esteves |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea var. atrofusca Backeb. |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea var. aurea (Backeb.) Backeb. |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea subsp. aureinitens (Buining & Brederoo) P.J.Braun & Esteves |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea var. aureinitens (Buining & Brederoo) P.J. Braun & Esteves |
Synonym |
 |
TRO |
|
| Frailea pygmaea subsp. aureispina (F.Ritter) P.J.Braun & Esteves |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea var. curvispina F.Ritter |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea var. dadakii (Frič) Backeb. |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea subsp. fulviseta (Buining & Brederoo) P.J.Braun & Esteves |
Accepted |
 |
WCSP (in review) |
|
| Frailea pygmaea var. lilalunula F.Ritter |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea subsp. lilalunula (F.Ritter) P.J.Braun & Esteves |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea var. longispina F.Ritter |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea var. maior F.Ritter |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea var. phaeodisca (Speg.) Y.Itô |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea var. planicosta F.Ritter |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea var. pulcherrima (Arechav.) Prestlé |
Synonym |
 |
WCSP (in review) |
|
| Frailea pygmaea subsp. pygmaea |
Synonym |
 |
TRO |
|
| Frailea pygmaea subsp. tuyensis (Buining & G.Moser) Metzing |
Accepted |
 |
WCSP (in review) |
|