https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:151095-2
Mammillaria hertrichiana R.T.Craig
First published in Mammill. Handb.: 92 (1945)
This name is a synonym of Mammillaria standleyi

https://www.inaturalist.org/flags/382171
Lodé recognizes more species that POWO lumps into M. standleyi, but M. hertrichiana is not one of them.