⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-5100371, with some changes.
This name is a synonym of Mammillaria flavescens var. nivosa (Link ex Pfeiff.) Backeb..
The record derives from Tropicos which reports it as a synonym (record 5100371) with original publication details: Enum. Diagn. Cact. 11 11 1837.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:134896-1.