Mammillaria vivipara var. vera Engelm. in Proc. Amer. Acad. Arts 3: 269. 1856 Mammillaria vivipara var. vera Engelm. in Proc. Amer. Acad. Arts 3: 269. 1856Type: United States of America: On the upper Missouri and Yellowstone rivers (not preserved).Taxon for this nameMammillaria vivipara var. vera Engelm.