Erigeron canadensis

Erigeron canadensis
Conservation status
	; Secure (NatureServe)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Erigeron
Species:	E. canadensis
Binomial name
	Erigeron canadensis; L.
Synonyms
	Alphabetical list Aster canadensis (L.) E.H.L.Krause ; Caenotus canadensis (L.) Raf. ; Caenotus pusillus Raf. ; Conyza canadensis (L.) Cronquist ; Conyza parva Cronquist ; Conyzella canadensis (L.) Rupr. ; Erigeron myriocephalus Rech.f. & Edelb. ; Erigeron paniculatus Lam. ; Erigeron pusillus Nutt. ; Erigeron ruderalis Salisb. ; Erigeron strictus DC. ; Inula canadensis Bernh. ; Leptilon canadense (L.) Britton ; Leptilon pusillum (Nutt.) Britton ; Marsea canadensis (L.) V.M.Badillo ; Senecio ciliatus Walter ; Tessenia canadensis (L.) Bubani ; Trimorpha canadensis (L.) Lindm. ; ;

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.

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