⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-50185669, 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 50185669) with original publication details: Cactaceae 4: 71-72, f. 66 71 1923.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:168765-2.