Eupatorium pilosum |
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ragged thoroughwort, rough boneset |
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Habit | Perennials, 30–100+ cm. |
Stems | (from short rhizomes) single, sparsely branched distally, densely puberulent to pilose throughout. |
Leaves | usually opposite (distal sometimes alternate); simple, sessile or subsessile; blades ± 3-nerved (distal to bases), elliptic, lanceolate, or lance-ovate, 30–90 × 20–45 mm (lengths mostly 2–2.5 times widths), bases rounded to rounded-cuneate, margins unevenly serrate, apices acute to attenuate, faces puberulent, gland-dotted. |
Florets | 5; corollas 3.5–4 mm. |
Phyllaries | 7–10 in 2–3 series, oblong to lance-oblong, 2–7 × 1–1.5 mm, apices (sometimes whitish) acuminate to acute, mucronate, abaxial faces puberulent, gland-dotted. |
Heads | in corymbiform arrays. |
Cypselae | 3–4 mm; pappi of 30–50 bristles 4–5 mm. |
2n | = 20, 30, 40. |
Eupatorium pilosum |
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Phenology | Flowering Jul–Sep. |
Habitat | Moist, low ground, margins of ponds, sandy soils, savannas, ditches |
Elevation | 20–100+ m (100–300+ ft) |
Distribution |
AL; CT; DE; FL; GA; KY; LA; MA; MD; MS; NC; NJ; NY; PA; RI; SC; TN; VA; WV
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Discussion | Eupatorium pilosum has been most commonly treated as a variety of E. rotundifolium; it is distinct morphologically by its leaves, which are narrower and 3-nerved distal to bases, rather than 3-nerved from bases. Distal leaves of E. pilosum tend to differ from the proximal by being alternate with entire margins. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 21, p. 471. |
Parent taxa | Asteraceae > tribe Eupatorieae > Eupatorium |
Sibling taxa | |
Synonyms | E. rotundifolium var. saundersii, E. verbenifolium |
Name authority | Walter: Fl. Carol., 199. (1788) |
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