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Yankeeweed

Eupatorium compositifolium Walt.

Description

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Perennials, 50–200 cm. Stems (from short caudices) single, branched distally, puberulent throughout (lateral buds often develop fertile and infertile branches). Leaves opposite (proximal) or alternate (lateral buds dormant or producing 1 pair of leaves); sessile; blades (often pinnately or ternately lobed) or lobes pinnately nerved, linear, 20–80 × 0.5–2.5(–4) mm, bases cuneate, margins entire, apices acuminate, faces puberulent, gland-dotted. Heads in paniculiform arrays. Phyllaries 7–10 in 2–3 series, (sometimes purple) elliptic to oblong, 1–3 × 0.5–0.8 mm, (margins hyaline) apices acuminate and mucronate, abaxial faces puberulent (mostly on midveins), usually gland-dotted. Florets 5; corollas (sometimes with purple throats) 2.5–3 mm. Cypselae 1–1.7 mm; pappi of 20–30 bristles 3–3.5 mm. 2n = 20.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 21: 463, 466, 472 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Flora of North America @ eFloras.org
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Flora of North America Editorial Committee
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Eupatorium compositifolium

provided by wikipedia EN

Eupatorium compositifolium, commonly called Yankeeweed, is a North American herbaceous perennial plant in the family Asteraceae native to the southern United States (from North Carolina to Florida and Texas).[3][4] Like other members of the genus Eupatorium it has inflorescences containing a large number of small, white flower heads, each with 5 disc florets but no ray florets. The plant is 0.5 to 2 metres (20-80 inches) tall.[5] Flowers bloom August to October. Its habitats include sand dunes, disturbed areas, and flat-woods.[3]

It is closely related to Eupatorium capillifolium and Eupatorium leptophyllum and some authors consider all of them to be varieties of E. capillifolium.[6] However, E. compositifolium is not as tall as E. capillifolium and is found in drier areas.[7]

Because it is not grazed by livestock, and mostly not eaten by wildlife, it is considered undesirable in places like pastures and controlled by means such as herbicides.[8]

References

  1. ^ "Eupatorium compositifolium". NatureServe Explorer. NatureServe. Retrieved 2010-09-12.
  2. ^ The Plant List, Eupatorium compositifolium Walter
  3. ^ a b "Eupatorium compositifolium". Flora of North America.
  4. ^ Biota of North America Program 2014 county distribution map
  5. ^ "Eupatorium". Flora of North America.
  6. ^ "Eupatorium capillifolium". Fire Effects Information System. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory. Retrieved 2008-08-06.
  7. ^ Gregory E. MacDonald, Barry J. Brecke and Donn G. Shilling (Jul–Sep 1992). "Factors Affecting Germination of Dogfennel (Eupatorium capillifolium) and Yankeeweed (Eupatorium compositifolium)". Weed Science. 40 (3): 424–428. doi:10.1017/S0043174500051857. JSTOR 4045284.
  8. ^ Robert E. Meyer and Rodney W. Bovey (Jan–Mar 1991). "Response of Yankeeweed (Eupatorium compositifolium) and Associated Pasture Plants to Herbicides". Weed Technology. 5 (1): 214–217. doi:10.1017/S0890037X00033558. JSTOR 3986818.
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Eupatorium compositifolium: Brief Summary

provided by wikipedia EN

Eupatorium compositifolium, commonly called Yankeeweed, is a North American herbaceous perennial plant in the family Asteraceae native to the southern United States (from North Carolina to Florida and Texas). Like other members of the genus Eupatorium it has inflorescences containing a large number of small, white flower heads, each with 5 disc florets but no ray florets. The plant is 0.5 to 2 metres (20-80 inches) tall. Flowers bloom August to October. Its habitats include sand dunes, disturbed areas, and flat-woods.

It is closely related to Eupatorium capillifolium and Eupatorium leptophyllum and some authors consider all of them to be varieties of E. capillifolium. However, E. compositifolium is not as tall as E. capillifolium and is found in drier areas.

Because it is not grazed by livestock, and mostly not eaten by wildlife, it is considered undesirable in places like pastures and controlled by means such as herbicides.

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cc-by-sa-3.0
copyright
Wikipedia authors and editors
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visit source
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wikipedia EN