Eupatorium scabridum Elliott. Phen: Late Jul-Oct. Hab: Pine savannas, wet pinelands, dry, gravelly oak savannas and probably oak-shortleaf pine savannas and open woodlands, powerlines, roadbanks (in grassland remnants). Dist: SC south to n. FL, west to AR, LA, and OK.
Origin/Endemic status: Endemic
Taxonomy Comments: This plant is believed to be an allopolyploid and apomictic derivative of the hybrid E. rotundifolium × semiserratum. In some areas it apparently consists only of short-lived diploids, but in others (according to Godfrey & Wooten  especially in SC, AR and LA) to occur as populations of polyploid apomicts. It resembles E. rotundifolium, but has cuneate leaves with a less prominent pair of lateral veins, narrower leaves, and is more likely to have 3-whorled leaves (as E. semiserratum often does).
Synonymy: = GW2, S; = Eupatorium rotundifolium L. var. scabridum (Elliott) A.Gray – Ar, FNA21, K1, K3, K4, SE1; = n/a – C, RAB; < Eupatorium rotundifolium L. – F, Fl7, Tx, WH3; < Eupatorium rotundifolium L. ssp. rotundifolium – Montgomery & Fairbrothers (1970); < Eupatorium scabridum Elliott – Tn