Mammillaria nuttallii var. borealis Engelm. in Proc. Amer. Acad. Arts 3: 264. 1856
Mammillaria nuttallii var. borealis in Proc. Amer. Acad. Arts 3: 264. 1856
Type: United States, on the Upper Missouri (not preserved)
Mammillaria nuttallii var. borealis in Proc. Amer. Acad. Arts 3: 264. 1856
Taxon for this name