| Horridocactus aconcaguensis (F.Ritter) Backeb. |
Unresolved |
 |
WCSP (in review) |
| Horridocactus andicola F.Ritter |
Unresolved |
 |
WCSP (in review) |
| Horridocactus armatus (F.Ritter) Backeb. |
Unresolved |
 |
WCSP (in review) |
| Horridocactus atroviridis (F.Ritter) Backeb. |
Unresolved |
 |
WCSP (in review) |
| Horridocactus carrizalensis (F.Ritter) Backeb. |
Unresolved |
 |
WCSP (in review) |
| Horridocactus choapensis (F.Ritter) Backeb. |
Unresolved |
 |
WCSP (in review) |
| Horridocactus crispus (F.Ritter) Backeb. |
Unresolved |
 |
WCSP (in review) |
| Horridocactus curvispinus (Bertero ex Colla) Backeb. |
Synonym |
 |
TRO |
| Horridocactus echinus (F.Ritter) Backeb. |
Unresolved |
 |
WCSP (in review) |
| Horridocactus engleri F. Ritter |
Synonym |
 |
TRO |
| Horridocactus eriosyzoides F.Ritter |
Unresolved |
 |
WCSP (in review) |
| Horridocactus garavantae F. Ritter |
Synonym |
 |
TRO |
| Horridocactus geissei (Poselg. ex K.Schum.) Dölz |
Unresolved |
 |
WCSP (in review) |
| Horridocactus grandiflorus (F.Ritter) Backeb. |
Unresolved |
 |
WCSP (in review) |
| Horridocactus heinrichianus Backeb. |
Synonym |
 |
TRO |
| Horridocactus horridus (Colla) Backeb. |
Unresolved |
 |
WCSP (in review) |
| Horridocactus kesselringianus Dölz |
Unresolved |
 |
WCSP (in review) |
| Horridocactus kunsei (C.F.Först.) F.Ritter |
Unresolved |
 |
WCSP (in review) |
| Horridocactus lissocarpus (F.Ritter) Backeb. |
Unresolved |
 |
WCSP (in review) |
| Horridocactus marksianus (F.Ritter) Backeb. |
Unresolved |
 |
WCSP (in review) |
| Horridocactus nigricans (Dietr. ex K.Schum.) Backeb. & Dolz |
Unresolved |
 |
WCSP (in review) |
| Horridocactus paucicostatus F. Ritter |
Synonym |
 |
TRO |
| Horridocactus tuberisulcatus (Jacobi) Y.Itô |
Unresolved |
 |
WCSP (in review) |
| Horridocactus vallenarensis (F.Ritter) Backeb. |
Unresolved |
 |
WCSP (in review) |