Opuntia mamillata A.Schott ex Engelm. in Proc. Amer. Acad. Arts 3: 308. 1856 Opuntia mamillata A.Schott ex Engelm. in Proc. Amer. Acad. Arts 3: 308. 1856Taxon for this nameOpuntia mamillata A.Schott ex Engelm.