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CCDB → Angiosperms → Compositae → Achillea → Achillea ptarmica Richards.

4 chromosome counts in Achillea ptarmica Richards.:

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		Name	Accepted Name	Gametophytic(n)	Sporophytic(2n)	Data Source	reference
!		Achillea ptarmica Richards.	Achillea ptarmica Richards.		18	British Isles cytology	Morton, J.K. Watsonia 11: 211-223 (1977)
!		Achillea ptarmica Richards.	Achillea ptarmica Richards.		18	British Isles cytology	Bailey, J.P., Gornall, R.J. Irish Naturalists' J. : ()
!		Achillea ptarmica Richards.	Achillea ptarmica Richards.		18	eFlora
!		Achillea ptarmica Richards.	Achillea ptarmica Richards.		18	C-values database	Dabrowska J. 1992. Chromosome number and DNA content in taxa of Achillea L. in relation to the distribution of the genus. Prace Botaniczne 49: 1-84.