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Published In: Eupatoria Verticillata no. 1. 1841. (Eupatoria Verticillata) Name publication detail

Project Name Data (Last Modified On 7/9/2009)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native


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3. Eupatorium fistulosum Barratt (hollow-stemmed Joe-pye weed)

Eutrochium fistulosum (Barratt) E.E. Lamont

Eupatoriadelphus fistulosus (Barratt) R.M. King & H. Rob.

Pl. 265 e–g; Map 1111

Stems 60–300 cm long, hollow between the nodes, with a relatively large central cavity (except sometimes toward the tip), usually glabrous below the inflorescence, more or less evenly dark purplish-tinged, moderately glaucous, generally lacking small axillary branches or fascicles of axillary leaves. Leaves mostly in whorls of 4–7, the uppermost leaves rarely opposite, the petiole 2–25 mm long. Leaf blades 5–30 cm long, 15–60 mm wide, narrowly to broadly lanceolate or elliptic-lanceolate, tapered at the base, tapered to a sharply pointed tip, the margins sharply toothed, the upper surface glabrous or sparsely short-hairy, the undersurface glabrous to sparsely to moderately short-hairy mostly along the veins, also glandular, with 1 main vein. Inflorescences terminal panicles, often large, usually narrowly dome-shaped. Involucre 6.5–9.0 mm long, slender, the bracts ovate to lanceolate or narrowly oblong-elliptic, rounded or bluntly pointed at the tip, often 3-nerved, often minutely hairy, often somewhat purplish-tinged. Disc florets 4–7(–8). Corollas 4.5–7.5 mm long, the surface often somewhat glandular, pale pink or less commonly somewhat purplish-tinged. Fruits 3.0–4.5 mm long. 2n=20. July–September.

Uncommon, mostly in the eastern half of the state and most frequently recorded from the Mississippi Lowlands Division (eastern Missouri west to Michigan, Missouri, and Texas; Canada). Bottomland forests, mesic upland forests, swamps, and banks of streams and rivers; also roadsides.

Eupatorium fistulosum tends to be the tallest Joe-pye weed in the state, with stems frequently more than 2 m. It also tends to have narrower main stem leaves than do E. maculatum and E. purpureum. Collectors sampling only the uppermost portion of the plant have been fooled by the stems, which frequently are solid rather than hollow toward the tip.



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