⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-5100364, and has not been changed.
This name is a synonym of Mammillaria heyderi subsp. macdougalii .
The record derives from Tropicos which reports it as a synonym (record 5100364
) with original publication details: Proc. Calif. Acad. Sci., ser. 4, 25: 265 265 1944.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:151107-2
.