Family Code: ASTERA Genus Code: AGERA2 Genus CN: snakeroot Genus Authority: Spach Genus Summary: A genus of about 250-290 species, American. The separation of Ageratina from Eupatorium is clearly warranted, on morphological, karyological, and molecular grounds. Genus References: Nesom in FNA (2006c); Clewell & Wooten (1971)=Z; Cronquist (1980)=SE. Key based in part on Z and SE. Last Updated: 2019-11-29 Publish: 1