Erigeron canadensis

Horseweed, a reference photo
Photo: Meteorquake · CC BY 4.0 (licence)

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.

From Wikipedia, under CC BY-SA 4.0.

Is it poisonous?

We have no record of Horseweed being toxic, poisonous or venomous. That is not proof that it is safe. Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.

Easily confused with

Classification

Kingdom
Plantae
Phylum
Tracheophyta
Class
Magnoliopsida
Order
Asterales
Family
Asteraceae
Species
Erigeron canadensis

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