Opuntia phaeacantha var. nigricans Engelm. in Proc. Amer. Acad. Arts 3: 293. 1856 Opuntia phaeacantha var. nigricans Engelm. in Proc. Amer. Acad. Arts 3: 293. 1856Taxon for this nameOpuntia phaeacantha var. nigricans Engelm.
