Erigeron canadensis Linnaeus. Common Horseweed. Phen: Jun-Nov. Hab: Old fields, disturbed areas, roadsides, gardens. Dist: S. Canada south through nearly all of the United States to tropical America.

Origin/Endemic status: Native

Synonymy: = F; = Conyza canadensis (L.) Cronquist var. canadensis – C, G, GrPl, Mo2, NcTx, Oh3, Pa, SE1, Va, W; = Erigeron canadensis L. var. canadensis – NY, RAB; = Leptilon canadense (L.) Britton – S; = Leptolon canadensis (L.) Britton; < Conyza canadensis (L.) Cronquist – Ar, Fl7, FNA20, Il, K2, Mex, Mi, NE, Ok, Tn, WH3; > Conyza canadensis (L.) Cronquist var. canadensis – Tx; > Conyza canadensis (L.) Cronquist var. glabrata (A.Gray) Cronquist – GrPl, Tx; < Erigeron canadensis L. – K3, K4, WV

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