Perennials, 20–100 cm. Stems usually 1, unbranched or sparingly branched distally, weakly to moderately winged, glabrous proximally, sparsely to moderately hairy distally. Leaves glabrous or sparsely hairy; basal blades oblanceolate to spatulate, entire or undulate to undulate-serrate; proximal and mid blades oblanceolate to lanceolate, usually entire, sometimes undulate to undulate-serrate; distal blades lance-linear, entire. Heads 1–10 per plant, borne singly or in paniculiform to corymbiform arrays. Peduncles (3–)6–11(–15) cm, sparsely to moderately hairy. Involucres hemispheric to globoid, 10–15 × 10–20 mm. Phyllaries (connate proximally) sparsely to moderately hairy. Ray florets 9–24, neuter; corollas yellow, 12.5–21 × 4–8 mm. Disc florets 200–500(–800+); corollas yellow proximally, usually purple to yellow or yellow-brown distally, 4–5.6 mm, lobes 5. Cypselae 1–1.4 mm, sparsely to moderately hairy; pappi of 6–8 entire, non-aristate scales 1–1.7 mm. 2n = 26, 28.
"Fibrous-rooted perennial 3–8 dm, glabrous or merely atomiferous-glandular below, the peduncles and involucres loosely puberulent; lvs relatively few, the basal tufted and generally persistent, oblanceolate or elliptic, usually petioled, 2–17 cm overall and 0.6–2(–3) cm wide; cauline lvs few, reduced, seldom exceeding the internodes, narrowly decurrent; heads 1–3(–6), naked-pedunculate, the disk hemispheric to subglobose, 1–2 cm wide, usually purple-brown or red-brown; rays ca 8 to ca 13, neutral, 1–2.5 cm, trilobed; pappus of 5–10 awnless, often distally rounded scales 1–1.7 mm; 2n=26, 28. Swampy or boggy places and moist pine woods; se. Va. to Fla., La., and Tenn. May, June. (H. curtisii, the rare form with yellow disk)"