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Eupatorium ×truncatum Muhlenberg ex Willdenow. Truncate Eupatorium. Phen: Aug-Oct. Hab: Moist, open areas, ditches, roadsides. Dist: NY, MI, and IA, south to NC, AL, MS, and w. LA.

Origin/Endemic status: Native

Taxonomy Comments: A hybrid of E. perfoliatum and E. serotinum. It is unclear the degree to which this hybrid reproduces independently and occurs independently of one or both parents, though McKain, Chapman, & Ingram (2010) found only F1 hybrids in their sampling. See McKain, Chapman, & Ingram (2010) and Tucker & Dill (1989) for additional, detailed information on this taxon.

Synonymy: = FNA21, K4, Tucker & Dill (1989a); = Eupatorium ×polyneuron (F.J.Herm.) Wunderlin – Il; = n/a – C, Pa, RAB; > Eupatorium perfoliatum L. var. cuneatum Engelm. – F; > Eupatorium resinosum Torr. ex DC. var. kentuckiense Fernald – F

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