Senecio congestus (R.Br.) 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 - Coarse, single-stemmed, fibrous-rooted annual or biennial 1.5–15 dm; pubescence spreading, crisp-villous, commonly persisting in large part until flowering time or beyond, especially in the infl; lvs entire or coarsely toothed, scarcely pinnatifid, rather equably distributed, 3–20 × 0.5–4.5 cm, the lower petiolate and often soon deciduous, the upper becoming sessile and ± clasping; heads several or numerous in an often congested infl, the disk 7–14 mm wide, or larger in fr; invol 7–10 mm, its bracts ca 21, very thin and generally pale, commonly with darker base; rays pale yellow, 4–9 mm; pappus accrescent, very fine and copious; achenes glabrous; 2n=48. Swamps and edges of ponds; circumpolar, s. in our range to Minn. and extreme n. Io. June–Aug. (S. palustris, a preoccupied name)
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Common Names
northern swamp-groundsel