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CCDB → Angiosperms → Rosaceae → Dryas → Dryas drummondii Richardson ex Hook.

5 chromosome counts in Dryas drummondii Richardson ex Hook.:

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		Name	Accepted Name	Gametophytic(n)	Sporophytic(2n)	Data Source	reference
		Dryas drummondii Richardson ex Hook.	Dryas drummondii Richardson ex Hook.		18	IPCN online	Dawe, J. C. & D. F. Murray. 1979. In IOPB chromosome number reports LXIII. Taxon 28: 265–268.
!		Dryas drummondii Richardson ex Hook.	Dryas drummondii Richardson ex Hook.		18	IPCN67-71	KNABEN, G. 1968. Chromosome numbers of flowering plants from Central Alaska. Nytt mag. bot. 15: 240-254.
!		Dryas drummondii Richardson ex Hook.	Dryas drummondii Richardson ex Hook.		18	IPCN67-71	MULLIGAN, G.A., & A.E. PORSILD. 1970. In IOPB chromosome number reports XXV. Taxon 19: 102-113:-
!		Dryas drummondii Richardson ex Hook.	Dryas drummondii Richardson ex Hook.		18	IPCN67-71	MULLIGAN, G.A., & A.E. PORSILD. 1969. Chromosome numbers of some plants from the unglaciated central Yukon plateau, Canada. Canad. J. Bot. 47: 655-662.
!		Dryas drummondii Richardson ex Hook.	Dryas drummondii Richardson ex Hook.		18	Fedorov, 1974	Packer 1964