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Much like no. 17 [Eupatorium sessilifolium L.], but more hairy, the stem loosely puberulent down to the middle or even to the base, the leaves also somewhat puberulent, especially beneath; lvs mostly 5-11 × 1.5-4.5 cm, 2-3(-3.5) times as long as wide, the base often more cuneate and not so broadly rounded as in no. 17, the venation strictly pinnate; 2n=30, 40. Woods and disturbed, open sites, usually in less acid soils than no. 17; N.J., Md., Va., and W.Va. to N.C. and Tenn. July-Sept. (E. vaseyi, misapplied) Possibly originating through hybridization of nos. 17 and 19 [Eupatorium rotundifolium L.], but now widespread and stable.
