Samiksha Jaiswal

Erigeron canadensis

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Kingdom  Plantae
Tribe  Astereae
Scientific name  Conyza canadensis
Rank  Species
Family  Asteraceae
Genus  Erigeron
Higher classification  Conyza
Order  Asterales
Erigeron canadensis Erigeron canadensis Canada fleabane Go Botany
Similar  Conyza, Fleabane, Erigeron annuus, Erigeron bonariensis, Conyza sumatrensis

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Erigeron canadensis (synonym Conyza canadensis) is an annual plant native throughout most of North America and Central America. It is also widely naturalized in Eurasia and Australia. Common names include horseweed, Canadian horseweed, Canadian fleabane, coltstail, marestail and butterweed. It was the first weed to have developed glyphosate resistance, reported in 2001 from Delaware.

Contents

Description

Erigeron canadensis Erigeron canadensis Wildflowers in Santa Barbara

Erigeron canadensis is an annual plant growing to 1.5 m (60 inches) tall, with sparsely hairy stems. The leaves are unstalked, slender, 2–10 cm long and up to 1 cm (0.4 inches) across, with a coarsely toothed margin. They grow in an alternate spiral up the stem and the lower ones wither early. The flowers are produced in dense inflorescences 1 cm in diameter. Each individual flower has a ring of white or pale purple ray florets and a centre of yellow disc florets. The fruit is a cypsela tipped with dirty white down.

Erigeron canadensis Horseweed Erigeron Canadensis Overview Health Benefits Side

Erigeron canadensis can easily be confused with Conyza sumatrensis, which may grow to a height of 2 m, and the more hairy Erigeron bonariensis which does not exceed 1 m (40 inches). Erigeron canadensis is distinguished by bracts that have a brownish inner surface and no red dot at the tip, and are free (or nearly free) of the hairs found on the bracts of the other species.

Distribution and habitat

Erigeron canadensis httpsuploadwikimediaorgwikipediacommonsthu

Horseweed originated in North America and is very widespread there, but has spread to inhabited areas of most of the temperate zone of Asia, Europe, and Australia. It is found in Britain from northern Scotland to Cornwall growing as a weed of arable land. It is not invasive of any natural or semi-natural habitats.

Weed status

Erigeron canadensis Erigeron canadensis

Horseweed is commonly considered a weed, and in Ohio it has been declared a noxious weed. It can be found in fields, meadows, and gardens throughout its native range. Horseweed infestations have reduced soybean yields by as much as 83%. It is an especially problematic weed in no-till agriculture, as it is often resistant to glyphosate and other herbicides. Farmers are advised to include 2,4-D or dicamba in a burndown application prior to planting to control horseweed.

Uses

Erigeron canadensis AgroAtlas Weeds Conyza canadensis L Crong Canada Fleabane

The Zuni people insert the crushed flowers of E. canadensis var. canadensis into the nostrils to cause sneezing, relieving rhinitis. A tincture can be made from the dried flowering tops of the plants.

Horseweed is a preferable material for use in the hand drill method of making friction fire.

References

Erigeron canadensis Wikipedia


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