Taxon: Helianthus nuttallii Torr. & A. Gray subsp. rydbergii (Britton) R. W. Long

Summary

Genus:

Helianthus

Family:

Asteraceae (alt. Compositae)

Subfamily:

Asteroideae

Tribe:

Heliantheae

Nomen number:

104315

Place of publication:

Brittonia 18:77. 1966

Verified:

03/08/2010 ARS Systematic Botanists.

Accessions:

12 (12 active, 12 available) in National Plant Germplasm System. (Map it)

Other conspecific taxa

Helianthus nuttallii Torr. & A. Gray (10 active accession[s])
Helianthus nuttallii Torr. & A. Gray subsp. nuttallii (25 active accession[s])
Helianthus nuttallii Torr. & A. Gray subsp. parishii (A. Gray) Heiser (0 active accession[s])

Autonyms (not in current use), synonyms and invalid designations

Basionym
Helianthus rydbergii Britton

Images (1 total. Click on image for more.)

Conservation Status

Reference(s)

Cronquist, A. et al. 1972-. Intermountain flora. Note: = Helianthus giganteus L.
FNA Editorial Committee. 1993-. Flora of North America.
Heiser, C. B., Jr. et al. 1969. The North American sunflowers (Helianthus). Mem. Torrey Bot. Club 22(3):152-154.
McGregor, R. L. et al. (The Great Plains Flora Association). 1986. Flora of the Great Plains.
Rogers, C. E. et al. 1982. Sunflower species of the United States 49.

Common names

Language	Name	Alternate name	note	seq	Citation
English	Rydberg's sunflower			1	Rogers, C. E. et al. 1982. Sunflower species of the United States 49.

Distribution

order_code	Status	Continent	Subcontinent	Country	State	Note	Reference
1	Native	Northern America	North-Central U.S.A.	United States	Iowa		FNA Editorial Committee. 1993-. Flora of North America.
1	Native	Northern America	North-Central U.S.A.	United States	Minnesota	w.	Heiser, C. B., Jr. et al. 1969. The North American sunflowers (Helianthus). Mem. Torrey Bot. Club 22(3):152-154.
1	Native	Northern America	North-Central U.S.A.	United States	Nebraska	n.-c.	Heiser, C. B., Jr. et al. 1969. The North American sunflowers (Helianthus). Mem. Torrey Bot. Club 22(3):152-154.
1	Native	Northern America	North-Central U.S.A.	United States	North Dakota		Heiser, C. B., Jr. et al. 1969. The North American sunflowers (Helianthus). Mem. Torrey Bot. Club 22(3):152-154.
1	Native	Northern America	North-Central U.S.A.	United States	South Dakota		Heiser, C. B., Jr. et al. 1969. The North American sunflowers (Helianthus). Mem. Torrey Bot. Club 22(3):152-154.
1	Native	Northern America	Northwestern U.S.A.	United States	Colorado		FNA Editorial Committee. 1993-. Flora of North America.
1	Native	Northern America	Northwestern U.S.A.	United States	Montana	n.e.	Heiser, C. B., Jr. et al. 1969. The North American sunflowers (Helianthus). Mem. Torrey Bot. Club 22(3):152-154.
1	Native	Northern America	Western Canada	Canada	Alberta	s.	Heiser, C. B., Jr. et al. 1969. The North American sunflowers (Helianthus). Mem. Torrey Bot. Club 22(3):152-154.
1	Native	Northern America	Western Canada	Canada	Manitoba	s.	Heiser, C. B., Jr. et al. 1969. The North American sunflowers (Helianthus). Mem. Torrey Bot. Club 22(3):152-154.
1	Native	Northern America	Western Canada	Canada	Saskatchewan	s.	Heiser, C. B., Jr. et al. 1969. The North American sunflowers (Helianthus). Mem. Torrey Bot. Club 22(3):152-154.

Native
Northern America

WESTERN CANADA: Canada [Saskatchewan (s.), Alberta (s.), Manitoba (s.)]
NORTH-CENTRAL U.S.A.: United States [Iowa, Minnesota (w.), Nebraska (n.-c.), North Dakota, South Dakota]
NORTHWESTERN U.S.A.: United States [Colorado, Montana (n.e.)]

Reference(s)

FNA Editorial Committee. 1993-. Flora of North America.
Heiser, C. B., Jr. et al. 1969. The North American sunflowers (Helianthus). Mem. Torrey Bot. Club 22(3):152-154.

Cite as: USDA, Agricultural Research Service, National Plant Germplasm System. 2026. Germplasm Resources Information Network (GRIN Taxonomy). National Germplasm Resources Laboratory, Beltsville, Maryland.
URL: https://npgstest.ars-grin.gov/gringlobal/taxon/taxonomydetail?id=104315. Accessed 9 May 2026.