Eupatorium mohrii Greene

Plants with short, conspicuously tuberous-thickened rhizomes, the erect branches therefrom often branching near ground-level into two or more aerial stems, these 3–10(–12) dm, puberulent or strigose-puberulent; lvs opposite or the upper alternate, rarely ternate, mostly lance-elliptic, tapering to the sessile or subsessile base, bluntly few-toothed, tending to be recurved or deflexed, small, mostly 1.5–6 cm × 3–10(–12) mm, glandular-punctate, strigose or subglabrous; invol 3–5 mm, its bracts imbricate, broadly obtuse to acutish, atomiferous-glandular and slightly to evidently villous-puberulent, the inner inconspicuously scarious-margined and often somewhat pale distally; fls 5(6), white; 2n=20, 30, 40. Pond-margins, ditches, shores, and moist low ground, often in sandy or peaty soil; coastal plain from se. Va. to Fla. and La. July–Sept. (E. recurvans, the sexual diploid phase)