⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-5108411, and has not been changed.
This name is a synonym of Mammillaria heyderi subsp. macdougalii (Rose) D.R. Hunt.
The record derives from Tropicos which reports it as a synonym (record 5108411) with original publication details: Stand. Cycl. Hort. 4: 1982 1982 1916.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:151210-2.