Helianthus angustifolius
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 | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Helianthus |
| Species: | H. angustifolius |
| Binomial name | |
| Helianthus angustifolius | |
| Synonyms[1] | |
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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. Agricultural Research Service, United States Department of Agriculture. Retrieved 19 January 2018.
- Biota of North America Program 2014 county distribution map
- Flora of North America, Helianthus angustifolius Linnaeus, 1753. Swamp sunflower
External links
- United States Department of Agriculture Plants Profile
- Photo of herbarium specimen at Missouri Botanical Garden, collected in Missouri in 1993
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