⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record kew-2813919, with some changes.
This name is a synonym of Frailea cataphracta subsp. duchii (G.Moser) P.J.Braun & Esteves.
The record derives from WCSP (in review) which reports it as a synonym with original publication details: Cact. Succ. J. (Los Angeles) 43: 139 1971.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:105544-2.