Eupatorium pilosum

Walter

Fl. Carol., 199. 1788.

Common names: Rough boneset
Endemic
Synonyms: Eupatorium rotundifolium var. saundersii (Porter ex Britton) Cronquist Eupatorium verbenifolium Michaux
Treatment appears in FNA Volume 21. Treatment on page 471. Mentioned on page 463, 464.

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 lanceovate, 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, glanddotted. Heads in corymbiform arrays. 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, glanddotted. Florets 5; corollas 3.5–4 mm. Cypselae 3–4 mm; pappi of 30–50 bristles 4–5 mm. 2n = 20, 30, 40.


Phenology: Flowering Jul–Sep.
Habitat: Moist, low ground, margins of ponds, sandy soils, savannas, ditches
Elevation: 20–100+ m

Distribution

V21-1180-distribution-map.gif

Ala., Conn., Del., Fla., Ga., Ky., La., Md., Mass., Miss., N.J., N.Y., N.C., Pa., R.I., S.C., Tenn., Va., W.Va.

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.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Eupatorium pilosum"
40 +, 30 +  and 20 +
not tailed +, truncate +, rounded +  and obtuse +
scarious +
usually ovate +  and lanceolate +
usually terete +  and clavate +
diffuse +  and dense +
indeterminate +  and determinate +
Kunsiri Chaw Siripun +  and Edward E. Schilling +
Walter +
puberulent +
rounded +  and rounded-cuneate +
enlarged +
3 cm30 mm <br />0.03 m <br /> (9 cm90 mm <br />0.09 m <br />) +
dissected +, lobed +, toothed +  and entire +
lanceovate;lanceolate;lanceovate;lanceolate;elliptic +
20mm;45mm +
papillate +  and rugose +
(4-)5-angled;10-ribbed +
filiform +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Rough boneset +
pinkish +  and white +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
prismatic +
fertile +  and bisexual +
Ala. +, Conn. +, Del. +, Fla. +, Ga. +, Ky. +, La. +, Md. +, Mass. +, Miss. +, N.J. +, N.Y. +, N.C. +, Pa. +, R.I. +, S.C. +, Tenn. +, Va. +  and W.Va. +
20–100+ m +
puberulent +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Moist, low ground, margins of ponds, sandy soils, savannas, ditches +
in usually determinate , rarely indeterminate , arrays +  and singly +
indeterminate +
each +  and sessile +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
obconic;ellipsoid +
subsessile +, sessile +  and simple +
triangular +
2-carpellate +
persistent +
Flowering Jul–Sep. +
nerved +  and 2-3-nerved +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
7 +  and 10 +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Fl. Carol., +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
appendaged +  and truncate +
hirsutulous +
papillate +
Eupatorium rotundifolium var. saundersii +  and Eupatorium verbenifolium +
Eupatorium pilosum +
Eupatorium +
species +
campanulate +
toothed +  and entire +
30 cm300 mm <br />0.3 m <br /> (100 cm1,000 mm <br />1 m <br />) +
vine +, shrub +  and subshrub +