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CCDB → Angiosperms → Cactaceae → Mammillaria → Mammillaria grahamii Engelm.

6 chromosome counts in Mammillaria grahamii Engelm.:

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		Name	Accepted Name	Gametophytic(n)	Sporophytic(2n)	Data Source	reference
		Mammillaria grahamii Engelm.	Mammillaria grahamii Engelm.		22	IPCN online	Weedin, J. F. & A. M. Powell. 1978. Chromosome numbers in Chihuahuan desert Cactaceae. Trans-Pecos Texas. Amer. J. Bot. 65: 531–537.
		Mammillaria microcarpa Engelm.	Mammillaria grahamii Engelm.	11		IPCN online	Pinkava, D. J., L. A. MCGILL & T. REEVES. 1977. Chromosome numbers in some cacti of western North America---III. Bull. Torrey Bot. Club 104: 105–110.
		Mammillaria grahamii Engelm.	Mammillaria grahamii Engelm.		22	IPCN75-78	Weedin & Powell 1978a
		Mammillaria microcarpa Engelm.	Mammillaria grahamii Engelm.	11		IPCN75-78	Pinkava et al. 1977
!		Mammillaria grahamii Engelm.	Mammillaria grahamii Engelm.		22	eFlora
		Mammillaria microcarpa Engelm.	Mammillaria grahamii Engelm.		22	Fedorov, 1974	Remski 1954