Eupatorium semiserratum DC.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Asteraceae
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Scientific Name
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Description
Species Description - Stems 5–12 dm, mostly solitary from a very short, stout rhizome or crown, densely villous-puberulent, sometimes also atomiferous-glandular, often with loose axillary fascicles of a few reduced lvs; lvs opposite or the uppermost scattered, firm, twisted at the base to bring the blade into a vertical plane, elliptic or elliptic-oblanceolate, mostly 4–8 cm × 8–30 mm, 2.5–6 times as long as wide, gradually narrowed to the sessile or shortly petiolar base, usually serrate or crenate- serrate, especially above the middle, finely and densely puberulent (and often also atomiferous-glandular), sometimes more shortly so above than beneath, triplinerved, the principal pair of lateral veins arising as branches from the midrib; invol 2.5–4 mm, softly short-hairy like the peduncles, its bracts imbricate, broadly rounded or obtuse to sometimes submucronately acute, the inner obscurely scarious-margined; fls 5; cor white, 2.5–3.5 mm; 2n=20. Low woods, clearings, and swampy places; Va. to s. Fla., w. to Tex., and n. into Ark., se. Mo., and s. Tenn. (E. cuneifolium var. s.)