Eupatorium vaseyi T.C. Porter. Vasey's Eupatorium. Phen: Jul-Oct. Hab: Moist to dry woodlands and openings, fire-maintained woodlands over mafic rocks (such as diabase). Dist: Various interpretations of this taxon have led to confusions and uncertainties regarding its distribution; Schilling (2011) shows records for e. TN and sc. KY and a recent discovery on Crowley's Ridge in AR (Witsell, pers. comm., 2017) represent the only confirmed distribution, but it should be sought elsewhere.

Origin/Endemic status: Endemic

Taxonomy Comments: This species is an apomictic species derived from E. petaloideum × sessilifolium (Schilling 2011). It has often been treated as a variety of E. album, but is better regarded as a species of hybrid origin.

Synonymy ⓘ: = K3, K4, Tn, Va, Montgomery & Fairbrothers (1970), Schilling (2011b); = Eupatorium sessilifolium L. var. vaseyi (Porter) Fernald & Griscom – K1, RAB, WV; ? Eupatorium album L. var. monardifolium Fernald – F, Tat; < Eupatorium album L. var. vaseyi (Porter) Cronquist – C, FNA21, SE1, W, Cronquist (1985); < Eupatorium godfreyanum Cronquist – Pa; < Eupatorium vaseyi Porter – G

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Heliophily ⓘ: 7