⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record kew-2689049, and has not been changed.
This name is a synonym of Melocactus curvispinus subsp. caesius .
The record derives from WCSP (in review) which reports it as a synonym with original publication details: Bull. Dept. Agric. Trinidad & Tobago 19: 86 1921.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:39543-2
.