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CCDB → Angiosperms → Compositae → Helianthus → Helianthus longifolius Hook.

4 chromosome counts in Helianthus longifolius Hook.:

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		Name	Accepted Name	Gametophytic(n)	Sporophytic(2n)	Data Source	reference
!		Helianthus longifolius Hook.	Helianthus longifolius Hook.	17(1)		Asteracea	Smith D. M. & M. 1959 Rhodora
!		Helianthus longifolius Hook.	Helianthus longifolius Hook.	1IV+15II, 17II(1)		Asteracea	Smith D. M. & M. 1959 Rhodora
!		Helianthus longifolius Hook.	Helianthus longifolius Hook.	17(3)		Asteracea	Heiser 1965 Ann. Missouri Bot. Gard.
!		Helianthus longifolius Hook.	Helianthus longifolius Hook.	17		Cave1959	Smith & Martin 1959