Mammillaria greggii (Engelm.) Saff. in Annual Rep. U.S. Natl. Mus. 1908: 531. 1909
Mammillaria greggii in Annual Rep. U.S. Natl. Mus. 1908: 531. 1909
is new combination for Mammillaria micromeris var. greggii in Proc. Amer. Acad. Arts 3: 261. 1856
Mammillaria greggii in Annual Rep. U.S. Natl. Mus. 1908: 531. 1909
Taxon for this name