Neomammillaria ruestii (Quehl) Britton & Rose, Cactaceae 4: 115. 1923 Neomammillaria ruestii (Quehl) Britton & Rose, Cactaceae 4: 115. 1923is new combination for Mammillaria ruestii Quehl in Monatsschr. Kakteenk. 15: 173. 1905Taxon for this nameNeomammillaria ruestii (Quehl) Britton & Rose