Helenium amphibolum A. Gray, Proc. Amer. Acad. Arts 9: 202. 1874

Plants 25–70 cm. Leaves: proximal blades usually irregularly toothed or lobed; mid and distal leaves usually entire. Heads 20–50. Peduncles 3–14 cm. Involucres 7–11 × 8–12(–13) mm. Ray florets 13–17; corollas 6.3–15(–19) × 2.2–5.5(–8.7) mm. Disc florets 250–500(–700+). Cypselae 0.7–1 mm; pappi 0.1–0.3(–0.4) mm. 2n = 26.

Flowering (Feb–)Mar–Jun(–Sep). Calcareous soils, ditches, washes, along streams; 300–1900 m; Tex.; Mexico (Coahuila, Nuevo León, San Luis Potosí, Tamaulipas).