Eupatorium serotinum Michx.
  • Fl. Bor.-Amer. 2: 100. 1803.

Cite taxon page as 'WFO (2021): Eupatorium serotinum Michx. Published on the Internet; Accessed on: 28 Sep 2021'

General Information

Perennials, 50–150+ cm. Stems (from short caudices) single, sparsely to densely branched distally, pubescent throughout (sometimes reddish to purplish). Leaves opposite; petiolate (petioles 10–25 mm); blades ± 3-nerved, lanceolate, 20–90+ × 5–40 mm, bases rounded to slightly oblique, margins entire or serrate, apices acute, faces puberulent, gland-dotted. Heads in corymbiform arrays. Phyllaries 8–12 in 1–2 series, elliptic to oblong, 1–3 × 0.5–1 mm, apices slightly rounded to acute, abaxial faces puberulent, gland-dotted. Florets 9–15; corollas 2.5–3 mm. Cypselae 1–1.5 mm; pappi of 20–30 bristles 2–2.5 mm. 2n = 20.

  • Provided by: [C].Flora of North America @
    • Source: [
    • 1
    • ]. 

    "Stems 4–20 dm, puberulent especially above; lvs opposite, with an evident petiole 1 cm or more, the blade lanceolate to ovate, serrate, mostly acuminate, 5–20 × 1.5–10 cm, 3–5-nerved or -plinerved, commonly less hairy than the stem, the upper surface often subglabrous; heads numerous; invol 3–4 mm, densely villous-puberulent, its bracts broadly rounded to merely obtuse, evidently imbricate in ca 3 series; fls 9–15 per head, white; 2n=20. Mostly in bottomlands and moist woods, sometimes in drier or more open places; s. N.Y. to Ill. and reputedly Minn., s. to Fla. and Tex.; casually intr. elsewhere, as in Conn. Aug.–Oct. E. serotinum var. polyneuron F. J. Herm. is a hybrid with E. perfoliatum."

  • Provided by: [B].New York Botanical Garden
    • Source: [
    • 2
    • ]. 


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    • A CC0 1.0 Universal (CC0 1.0).
    New York Botanical Garden
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
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    Flora of North America @
    'Flora of North America @ eFloras (2008). Published on the Internet [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • C Flora of North America Association
    World Flora Online consortium
    World Flora Online Data. 2018.
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