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. Although, in general, this species prefers low, moist ground, it is tolerant of conditions varying from bogs and swamps near sea level to relatively dry, well drained, gravelly clay.[4] It is not particularly drought resistant.[5]
| Helianthus angustifolius | |
|---|---|
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Helianthus |
| Species: | H. angustifolius
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| 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 centimetres (5.9 in) long. It is a perennial herb sometimes as much as 150 centimetres (59 in) tall. One plant can produce 3-16 flower heads, each with 10-20 ray florets surrounding at least 75 disc florets.[6]
References
edit- ^ "Helianthus angustifolius L." The Plant List. Archived from the original on 26 July 2020. Retrieved 4 July 2015.
- ^ "Helianthus angustifolius". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture. Retrieved 19 January 2018.
- ^ "Helianthus angustifolius county distribution map". Biota of North America Program. 2014. Archived from the original on 10 May 2015. Retrieved 4 July 2015.
- ^ Martin WC Jr (1958). The Taxonomy of Helianthus angustifolius and Related Species (PhD thesis). Indiana University. ProQuest 301906123. Retrieved 30 July 2024.
- ^ Chapman DS, Auge RM (March 1994). "Physiological-Mechanisms of Drought Resistance in 4 Native Ornamental Perennials". Journal of the American Society for Horticultural Science. 119 (2): 299–306. doi:10.21273/JASHS.119.2.299. Archived from the original on 20 May 2024. Retrieved 30 July 2024.
- ^ "Helianthus angustifolius Linnaeus, 1753". Flora of North America. Archived from the original on 30 April 2015. Retrieved 4 July 2015.
External links
edit- United States Department of Agriculture Plants Profile
- Photo of herbarium specimen at Missouri Botanical Garden, collected in Missouri in 1993
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