Helianthus nuttallii

Helianthus nuttallii
Conservation status
Least Concern  (IUCN 3.1)[1]
Secure  (NatureServe)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Helianthus
Species:	H. nuttallii
Binomial name
Helianthus nuttallii Torr. & A.Gray
Synonyms[2]
Helianthus fascicularis Greene Helianthus parishii A.Gray, syn of subsp. parishii Helianthus rydbergii Britton, syn of subsp. rydbergii

Helianthus nuttallii, or Nuttall's sunflower, is a species of sunflower native to northern, central, and western North America, from Newfoundland west to British Columbia, south to Missouri, New Mexico, and California.[3]

Helianthus nuttallii is a herbaceous perennial plant growing to 50–400 cm (20-160 inches) tall. The leaves are opposite on the lower part of the stem, alternate higher up, narrow lanceolate, 8–20 cm (3.2-8.0 inches) long and 6–30 mm wide, with a rough texture. The flowers are yellow, produced in a flowerhead approximately 9 cm (3.6 inches) diameter with 10–20 ray florets and at least 60 disc florets; each stem bears one to a few flowerheads.[4][5]

Subspecies of Helianthus nuttallii include:[2][3][4]

• Helianthus nuttallii subsp. nuttallii - Canada, western United States.^[citation needed] H. nuttallii subsp. nuttallii is considered by some to be a synonym for H. nuttallii.[6] However, others argue that it is distinct from the species.[7]
• Helianthus nuttallii subsp. parishii (A.Gray) Heiser - (Los Angeles sunflower). Southern California, endemic. The subspecies is presumed to be extinct since 1937.[8]
• Helianthus nuttallii subsp. rydbergii (Britton) R. Long. - Central Canada, interior northwestern United States

References

1. Rhodes, L.; Maxted, N. (2016). "Helianthus nuttallii". IUCN Red List of Threatened Species. 2016: e.T20694327A20695331. doi:10.2305/IUCN.UK.2016-3.RLTS.T20694327A20695331.en. Retrieved 20 November 2021.
2. "Helianthus nuttallii". The Global Compositae Checklist (GCC) – via The Plant List. Note that this website has been superseded by World Flora Online
3. "Helianthus nuttallii". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture. Retrieved 19 January 2018.
4. Jepson Flora: Helianthus nuttallii
5. Plants of British Columbia: Helianthus nuttallii
6. "Helianthus nuttallii". The Global Compositae Checklist (GCC) – via The Plant List. Note that this website has been superseded by World Flora Online
7. Baldwin, B. G., D. H. Goldman, D. J. Keil, R. Patterson, T. J. Rosatti, and D. H. Wilken, editors. 2012. "The Jepson Manual: vascular plants of California", second edition. University of California press, Berkeley. ISBN 9780520253124. pp 344
8. Calflora taxon report, University of California, Helianthus nuttallii Torrey & A. Gray ssp. parishii (A. Gray) Heiser, Los Angeles sunflower, Parish's sunflower