Krainzia longiflora (Britton & Rose) Backeb. in Blätt. Kakteenf. 1938(6): 12, 20. 1938 Krainzia longiflora (Britton & Rose) Backeb. in Blätt. Kakteenf. 1938(6): 12, 20. 1938is new combination for Neomammillaria longiflora Britton & Rose, Cactaceae 4: 163–164, f. 181. 1923Taxon for this nameKrainzia longiflora (Britton & Rose) Backeb.