''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. It is typically found in the coastal plain habitat , particularly in wet areas.
''Helianthus angustifolius'' is often cultivated for its bright, showy yellow flowers. Leaves are long and narrow, up to 15 cm long. It.. more