3. Helenium pinnatifidum (Schweinitz ex Nuttall) Rydberg in N. L. Britton et al., N. Amer. Fl. 34: 130. 1915.
Leptopoda pinnatifida Schweinitz ex Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 372. 1841
Perennials, 30–80 cm. Stems usually 1, usually unbranched distally, weakly winged, glabrous or sparsely to moderately hairy proximally, sparsely to moderately hairy distally. Leaves usually glabrous, rarely sparsely hairy; basal blades obovate to oblanceolate, usually pinnatifid, sometimes undulate to undulate-serrate, rarely entire; proximal and mid blades linear-oblanceolate to lance-linear, entire or undulate-serrate; distal blades lance-linear, entire. Heads 1(–3) per plant, usually borne singly. Peduncles 3–20 cm, moderately to densely hairy. Involucres hemispheric, 12–20 × 15–30 mm. Phyllaries moderately hairy. Ray florets 13–34, neuter; corollas yellow, 15–22 × 5–8 mm. Disc florets 250–650(–800+); corollas yellow proximally, yellow to yellow-brown distally, 4–5.5 mm, lobes 5. Cypselae 1.2–1.4 mm, moderately hairy; pappi of 8–11 entire or slightly lacerate, non-aristate scales 1.2–1.5 mm. 2n = 32, 34.
Flowering (Feb–)Mar–Apr(–May). Ditches, other moist areas such as wet woods, bogs, and swamp edges; 10–50 m; Fla., Ga., N.C., S.C.