Ageratina macbridei

Ageratina macbridei is a species of flowering plant in the aster family. It is endemic to Peru, where it occurs in several types of habitats, often near rivers.
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.