Helianthus occidentalis (fewleaf sunflower or western sunflower) is a species of sunflower native to the eastern and central United States. It grows mostly in the Great Lakes Region and in the Ozarks, with additional populations scattered as far as Massachusetts, Texas, and the Florida Panhandle.
Helianthus occidentalis differs from other, similar species by its sparse leaves, most of which are crowded around the lower part of the stem. This perennial plant reaches heights from two to five feet (60-150 cm). It produces one to several yellow flower heads, each with 8-14 ray florets surrounding more than 50 disc florets.
- Helianthus occidentalis subsp. occidentalis - most of species range
- Helianthus occidentalis subsp. plantagineus (Torr. & A.Gray) Shinners - Texas, Arkansas
- photo of herbarium specimen at Missouri Botanical Garden, collected in Illinois in 1904, type specimen of Helianthus illinoensis, syn of Helianthus occidentalis'
- The Plant List, Helianthus occidentalis Riddell
- Flora of North America, Helianthus occidentalis Riddell, 1836. Western sunflower
- Biota of North America Program 2014 county distribution map
- Riddell, John Leonard 1836. Western Journal of the Medical and Physical Sciences 9(36): 577
- Tropicos, Helianthus occidentalis Riddell
- United States Department of Agriculture plants profile
- Missouri Plants identification photos
- Robert W. Freckmann Herbarium, UW - Stevens Point
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