⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record kew-2813898, and has not been changed.
This name is a synonym of Frailea buenekeri subsp. densispina .
The record derives from WCSP (in review) which reports it as a synonym with original publication details: Cactus & Co. 5: 142 2001.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:20000710-1
.