Torr. & A.Gray
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.
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.
- Helianthus nuttallii subsp. nuttallii - Canada, western United States. H. nuttallii subsp. nuttallii is considered by some to be a synonym for H. nuttallii. However, others argue that it is distinct from the species.
- Helianthus nuttallii subsp. parishii (A.Gray) Heiser - (Los Angeles sunflower). Southern California, endemic. It is an endangered subspecies thought to have been extinct since 1937, but it was rediscovered in southern California in 2001.
- Helianthus nuttallii subsp. rydbergii (Britton) R. Long. - Central Canada, interior northwestern United States
- The Plant List, Helianthus nuttallii Torr. & A.Gray
- Germplasm Resources Information Network: Helianthus nuttallii
- Jepson Flora: Helianthus nuttallii
- Plants of British Columbia: Helianthus nuttallii
- 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
- 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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