Ageratina thyrsiflora

{{Short description|Species of flowering plant}}

{{Speciesbox

| image =

| genus = Ageratina

| species = thyrsiflora

| authority = (Greene) R.M.King & H.Rob.

| synonyms_ref = {{ThePlantList |id=gcc-15206 |taxon=Ageratina thyrsiflora |authority=(Greene) R.M.King & H.Rob.}}

| synonyms =

• Eupatorium thyrsiflorum (Greene) B.L.Rob.
• Kyrstenia thyrsiflora Greene

}}

Ageratina thyrsiflora is a North American species of plants in the family Asteraceae. It is native mostly to northwestern Mexico (states of Chihuahua, Durango, Jalisco, Sinaloa, and Sonora). The range extends just barely into the United States, a single herbarium specimen having been collected in 1929 just north of the border town of Nogales, Arizona.{{eFloras|1|250066023|Ageratina thyrsiflora |first=Guy L. |last=Nesom |volume=21}}{{BONAP |genus=Ageratina |species=thyrsiflora |date=2014}}Turner, B. L. 1997. The Comps of Mexico: A systematic account of the family Asteraceae, vol. 1 – Eupatorieae. Phytologia Memoirs 11: i–iv, 1–272