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Helenium amarum
A summer annual about ½-2½' tall. Each head has a rounded center of golden yellow disc florets and a fringe of usually lighter yellow ray florets which are reflexed away from the center.
A riparian wildlife area along the edge of Lake Lewisville. This was spotted on a day hike along the edge of the lake traveling south and west.
The genus is thought to have been named by Linnaeus for Helen of Troy. The legend is that the flowers sprung up from the ground where her tears fell.
H. autumnale has lanced shaped leaves, not the filiform of H. amarum, that you have here.