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CCDB → Angiosperms → Cactaceae → Echinomastus → Echinomastus johnstonii E. M. Baxter

4 chromosome counts in Echinomastus johnstonii E. M. Baxter:

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		Name	Accepted Name	Gametophytic(n)	Sporophytic(2n)	Data Source	reference
!		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.
!		Echinomastus johnstonii	Echinomastus johnstonii E. M. Baxter		22	eFlora