Mammillaria vivipara var. aggregata (Engelm.) L.D.Benson in Proc. Calif. Acad. Sci., ser. 4, 25: 262. 1944
Mammillaria vivipara var. aggregata in Proc. Calif. Acad. Sci., ser. 4, 25: 262. 1944
is new combination for Mammillaria aggregata, Emory, Mil. Reconn.: 156. 1848