1) Asterid dicot genus 2) Genus ageratina 
These plants grow mainly in the warmer regions of the Americas and West Indies. Over 150 species are native to Mexico. Some flourish in the cooler areas of the eastern United States. Two Mexican species have become a pest in parts of Australia and Taiwan. Ageratina used to belong to the genus Eupatorium, but it has been reclassified. The infloresc...
[n] - annual to perennial herbs or shrubs of eastern United States and Central and South America
genus Ageratina noun annual to perennial herbs or shrubs of eastern United States and Central and South America