Pachythamnus
Introduction '''''Pachythamnus''''' is a genus of Mesoamerican flowering plants in the tribe Eupatorieae within the family Asteraceae. ;SpeciesThe only known species is '''''Pachythamnus crassirameus''''', native to Guatemala, Nicaragua, El Salvador, and central and southern Mexico.
Etymology ''Ageratina'' is derived from Greek meaning 'un-aging', in reference to the flowers keeping their color for a long time. This name was used by Dioscorides for a number of different plants.
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