Conoclinium coelestinum (Linnaeus) A.P. de Candolle. Phen: Late Jul-Oct. Hab: Streambanks, moist to wet disturbed areas, especially ditches, probably more common than formerly. Dist: NJ west to IL, c. MO, se. KS, and OK, south to s. FL and c. TX; also in Cuba, and scattered farther north (as in NY, n. OH, and n. IN) probably as escapes from cultivation.
Origin/Endemic status: Native
Taxonomy Comments: See Wooten & Clewell (1971) for further discussion of this species.
Synonymy: = Medford, Poindexter, & Weakley (2020) in Weakley et al (2020), Schilling et al (2019b); < Conoclinium coelestinum (L.) DC. – Ar, Fl7, FNA21, Il, K3, K4, Mi, NY, Ok, S, Tn, Va, WH3; < Conoclinum coelestinum – Pa, misspelling; < Eupatorium coelestinum L. – C, F, G, GrPl, NcTx, Oh3, RAB, SE1, Tx, W, WV