Helianthus angustifolius is a species of sunflower known by the common name narrowleaf sunflower or swamp sunflower. It is native to the south-central and eastern United States, found in all the coastal states from Texas to Long Island, and inland as far as Missouri. It is typically found in the coastal plain habitat (both the Atlantic and Gulf), particularly in wet areas.
Helianthus angustifolius is often cultivated for its bright, showy yellow flowers. Leaves are long and narrow, up to 15 cm (6 inches) long. It is a perennial herb sometimes as much as 150 cm (5 feet) tall. One plant can produce 3-16 flower heads, each with 10-20 ray florets surrounding as least 75 disc florets.
- The Plant List, Helianthus angustifolius L.
- "Helianthus angustifolius". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 19 January 2018.
- Biota of North America Program 2014 county distribution map
- Flora of North America, Helianthus angustifolius Linnaeus, 1753. Swamp sunflower
- United States Department of Agriculture Plants Profile
- Photo of herbarium specimen at Missouri Botanical Garden, collected in Missouri in 1993
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