Classification
Kingdom: Plantae (2653)
Phylum: Tracheophyta (2566)
Class: Magnoliopsida (2162)
Order: Asterales (223)
Family: Asteraceae (222)(family description)
Genus: Ageratina (2)
Epithet: ligustrina (DC.) R.M.King & H.Rob. (2)
Synonyms: Ageratina caeciliae (B.L.Rob.) R.M.King & H.Rob., Ageratina plethadenia (Standl. & Steyerm.) R.M.King & H.Rob., Eupatorium biceps Klotzsch ex Vatke, Eupatorium caeciliae B.L.Rob., Eupatorium ligustrinum DC., Eupatorium myriadenium Schauer, Eupatorium plethadenium Standl. & Steyerm., Eupatorium semialatum Benth., Eupatorium vetularum Standl. & Steyerm., Eupatorium weinmannianum Regel & Körn.
biceps => double-headed
caeciliae => in honor of Cecil Joslin Brooks (1875–1953), English plant collector in Borneo and Sumatra
ligustrina => resembles Ligustrum
ligustrinum => resembles Ligustrum
semialatum => half winged, more or less winged, occasionally winged
vetularum => of old women