Helianthus nuttallii

Helianthus nuttallii (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
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Genus:
Helianthus
Species:
H. nuttallii
Binomial name
Helianthus nuttallii
Synonyms[2]
  • Helianthus fascicularis Greene
  • Helianthus parishii A.Gray, syn of subsp. parishii
  • Helianthus rydbergii Britton, syn of subsp. rydbergii

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. 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.
  2. "Helianthus nuttallii". The Global Compositae Checklist (GCC) – via The Plant List.
  3. "Helianthus nuttallii". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). 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.
  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


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