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7d. Helianthus debilis Nuttall subsp. tardiflorus Heiser, Madroño. 13: 154, figs. 5, 6. 1956.
Helianthus debilis var. tardiflorus (Heiser) Cronquist
Stems erect, glabrous or sparsely hispid. Leaf blades 5–9(–10) cm , margins usually deeply, irregularly serrate, abaxial faces densely gland-dotted. Peduncles 10–25 cm. Ray laminae 14–16(–20) mm. Discs 14–15 mm diam. 2n = 34.
Flowering spring–fall. Sandy beaches; 0–30+ m; Ala., Fla., Ga., Miss.
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