Mammillaria hemisphaerica var. waltheri (Boed.) R.T.Craig, Mammill. Handb.: 95. 1945
Mammillaria hemisphaerica var. waltheri, Mammill. Handb.: 95. 1945
is new combination for Mammillaria waltheri in Z. Sukkulentenk. 3(4): 72–73, unnumbered pl. 1927–1928