Mexerion is a genus of flowering plants in the tribe Gnaphalieae within the family Asteraceae., the number of species accepted varies from one to three.
The genus was erected by Guy L. Nesom in 1990, with two species, M. mexicanum and the type species M. sarmentosum. In 2023, Nesom added a third species, M. stolonatum, transferred from Chionolaena., Plants of the World Online accepted only M. mexicanum and M. stolonatum, while the World Flora Online accepted only M. mexicanum.
, Tropicos listed three species: