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CCDB → Angiosperms → Boraginaceae → Hydrophyllum → Hydrophyllum virginianum L.

9 chromosome counts in Hydrophyllum virginianum L.:

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		Name	Accepted Name	Gametophytic(n)	Sporophytic(2n)	Data Source	reference
		Hydrophyllum virginianum L.	Hydrophyllum virginianum L.		18	IPCN online	Freeman, C. C. & R. E. Brooks. 1988. Documented plant chromosome numbers 1988: 1. Chromosome counts for North American plants -- I. Sida 13: 241–250.
		Hydrophyllum virginianum L.	Hydrophyllum virginianum L.		18	IPCN online	Wcislo, H. 1987. Chromosome numbers of certain Canadian plants. Acta Biol. Cracov., Ser. Bot. 29: 19–30.
		Hydrophyllum virginianum L.	Hydrophyllum virginianum L.	9		IPCN online	Hill, L. M. 1989. IOPB chromosome data 1. Int. Organ. Pl. Biosyst. Newslett. (Zurich) 13: 17–19.
		Hydrophyllum virginianum L.	Hydrophyllum virginianum L.	9	18	IPCN online	Harriman, N. A. 1981. In Chromosome number reports LXX. Taxon 30: 77–78.
		Hydrophyllum virginianum L.	Hydrophyllum virginianum L.		18	IPCN online	Gillett, J. M. 1975. In IOPB chromosome number reports L. Taxon 24: 671–678.
!		Hydrophyllum virginianum L.	Hydrophyllum virginianum L.		18	Fedorov, 1974	Bowden 1940a, 1945a
!		Hydrophyllum virginianum L.	Hydrophyllum virginianum L.		18	Fedorov, 1974	Cave, Constance 1950
!		Hydrophyllum virginianum L.	Hydrophyllum virginianum L.		18	Fedorov, 1974	Constance 1963
!		Hydrophyllum virginianum L.	Hydrophyllum virginianum L.		18	Darlington, 1955