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Swamp Sunflower, Narrow-leaf Sunflower - Helianthus angustifolius


Family: Asteraceae - Aster family Genus Common Name: Sunflower Native Status: NativeDicot Perennial Herb
Helianthus angustifolius - Swamp Sunflower, Narrow-leaf Sunflower. aka Narrow-leaved Sunflower. Relatively easy sunflower to identify due to the narrow leaves, which are no longer than normal for a sunflower, but much narrower. The stem of Helianthus angustifolius has coarse hairs, especially on the lower part of the plant. The leaves also have hairs on the edge near the stem. Narrow-leaf sunflower has yellow ray flowers with darker disk flowers than many other sunflowers.

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Helianthus angustifolius

Distribution of Helianthus angustifolius in the United States and Canada:
Map unavailable.
Map courtesy of The Biota of North America Program.
Map color key

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Site: Walker County, GA Date: 2009-October-03Photographer: Gerald C. Williamson
Helianthus angustifolius may have as few as 8 ray flowers or as many as 20 surrounding the dark disk. The ray flowers are between 3/4 and 1.5 inches long. The disk is usually an inch across or less. The disk flowers develop the seeds, which are useful for wildlife.
Helianthus angustifolius
Site: Walker County, Ga Date: 2009-October-03Photographer: Gerald C Williamson
Narrow-leaf sunflower plants will bear many flowering heads.
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Helianthus angustifolius
Site: Walker County, Ga Date: 2009-October-03Photographer: Gerald C Williamson
The leaves are up to 6 inches long and rarely more than ½ inch wide, alternating as they rise up the stem. The branches of the plant form at the leaf axils.
Click on the photo for a larger image
Helianthus angustifolius
Site: Walker County, Ga Date: 2009-October-03Photographer: Gerald C Williamson
Each of the several to many branches of Helianthus angustifolius terminate in a blossom.
Click on the photo for a larger image
Helianthus angustifolius
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Helianthus angustifolius initially published on USWildflowers.com 2009-10-03; Updated 2015-06-24

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All content except USDA Plants Database map Copyright Gerald C. Williamson 2024
Photographs Copyright owned by the named photographer



Code Update 20230302