Pediocactus simpsonii var. nigrispinus Hochstätter in Succulenta (Netherlands) 69(9): 178-179. 1990
Pediocactus simpsonii var. nigrispinus in Succulenta (Netherlands) 69(9): 178-179. 1990
is basionym for Pediocactus nigrispinus in Succulenta (Netherlands) 71(3): 99. 1992