Grusonia densispina (Ralston & Hilsenb.) Pinkava in J. Arizona-Nevada Acad. Sci. 34(1): 45. 2002 sec. Kew WCVP (2019)
- ≡Opuntia densispina Ralston & Hilsenb. in Madroño 39(4): 281–284, f. 1. 1992 syn. sec. Hunt 2016
- ≡Corynopuntia densispina (Ralston & Hilsenb.) Fensterm. in Phytoneuron 2016-1: 24. 2016 syn. sec. Kew WCVP (2019)