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CCDB → Angiosperms → Cactaceae → Echinomastus → Echinomastus johnstonii
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| ! | Echinomastus johnstonii | Echinomastus johnstonii E. M. Baxter | 22 | eFlora | |||
| ! | Echinomastus johnstonii (ENGELMANN) E. M. BAXTER | Echinomastus johnstonii E. M. Baxter | 11 | Baker, 2009 | |||
| ! | Neolloydia johnsonii (Parry) L. D. Benson | Echinomastus johnstonii E. M. Baxter | 11 | IPCN online | Pinkava, D. J. & B. D. Parfitt. 1982. Chromosome numbers in some cacti of western North America IV. Bull Torrey Bot. Club. 109: 121–128. | ||
| ! | Neolloydia johnsonii (Parry) L. D. Benson | Echinomastus johnstonii E. M. Baxter | 11 | IPCN73-74 | PINKAVA, D.J., M.G. MCLEOD, L.A. MCGILL, & R.C. BROWN. 1973. Chromosome numbers in some cacti of western North America-II. Brittonia 25: 2-9. |