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. 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
Conservation status
Secure  (NatureServe)
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 L.
Synonyms[1]
Coreopsis angustifolia L. 1753 not Ait. 1789 Discomela angustifolius Raf.

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]