Monographs Details: Heliopsis helianthoides (L.) Sweet
Authority: Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Description:Species Description - Robust, fibrous-rooted perennial 5–15 dm; lvs ovate or lance- ovate, often subtruncate at base, serrate, 5–15 × 2.5–8 cm, on petioles 5–35 mm; heads naked-pedunculate, the disk 1–2.5 cm wide; rays 8–16, rather pale yellow, 1.5–4 cm; achenes essentially glabrous; 2n=28. Rich to dry woods, prairies, and waste places; Que. to B.C., s. to Ga. and N.M. July–Oct. Var. helianthoides, with glabrous, often glaucous stem and rather thin lvs smooth on both sides or merely slightly scabrous above, occurs from N.Y. to Mich. and Ill., and s. to Ga. and Miss. Var. scabra (Dunal) Fernald, with firmer lvs scabrous on both sides, the stem often scabrous as well, occurs in the Great Plains and prairie region, and e. across the n. part of our range to the Atlantic. (H. scabra)