Eupatorium sessilifolium Linnaeus var. sessilifolium . Phen: Jul-Oct. Hab: Open upland woodlands and woodland borders, especially calcareous or mafic. Dist: S. NH west to se. MN, south to n. GA, n. AL, n. MS, n. AR, and e. KS.
Origin/Endemic status: Native
Taxonomy Comments: Grubbs, Small, & Schilling (2009) discuss the genetics of E. sessilifolium; most of the species’ distribution consists of agamospermous triploids, with sexual diploids only known from two disjunct areas of the southern Appalachians (w. VA, and w.NC-e. TN). There may be merit to the taxonomic recognition of the diploids and the triploids.
Synonymy: = F, K1, Va, WV; = n/a – Il; < Eupatorium sessilifolium L. – Ar, C, FNA21, G, K3, K4, Mi, NE, NY, Oh3, Pa, S, SE1, Tn, W, Cronquist (1985), Montgomery & Fairbrothers (1970), Schilling (2011a), Siripun & Schilling (2006); < Eupatorium sessilifolium L. var. sessilifolium – RAB