Helianthus angustifolius

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Campanulids
Ordo: Asterales

Familia: Asteraceae
Subfamilia: Asteroideae
Tribus: Heliantheae
Subtribus: Helianthinae
Genus: Helianthus
Species: Helianthus angustifolius
Name

Helianthus angustifolius L., 1753
Synonyms

Coreopsis angustifolia (L.) L.
Discomela angustifolius (L.) Rafin.
Helianthus angustifolius var. planifolius Fern.
Leighia bicolor Cass.
Rudbeckia angustifolia (L.) L.

Distribution
Native distribution areas:

Continental: Northern America
USA (Alabama, Arkansas, Florida, Georgia, Indiana, Iowa, Kentucky, Louisiana, Maryland, Mississippi, Missouri, New Jersey, North Carolina, Ohio, Oklahoma, Pennsylvania, South Carolina, Tennessee, Texas, Virginia, West Virginia)

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition
References

Linnaeus, C. 1753. Species Plantarum. Tomus II: 906. Reference page.

Links

International Plant Names Index. 2018. Helianthus angustifolius. Published online. Accessed: Feb. 07 2018.
The Plant List 2013. Helianthus angustifolius in The Plant List Version 1.1. Published on the internet. Accessed: 2018 Feb. 07.
Tropicos.org 2018. Helianthus angustifolius. Missouri Botanical Garden. Published on the internet. Accessed: 2018 Feb. 07.
Hassler, M. 2018. Helianthus angustifolius. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2018. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2018 Feb. 07. Reference page.
USDA, ARS, Germplasm Resources Information Network. Helianthus angustifolius in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 07-Oct-06.

Vernacular names
English: narrowleaf sunflower, swamp sunflower

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.[2][3] 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 at least 75 disc florets.[4]
References

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