Calflora
Taxon  Report   117    
Ageratina adenophora  (Spreng.) R. M. King & H. Rob.
Sticky snakeroot,  Thoroughwort
Ageratina adenophora
© 2009 Neal Kramer
Photos from
CalPhotos / Calflora
Ageratina adenophora
© 2018 Julian Geoghegan
Ageratina adenophora
© 2015 Richard Spellenberg
Ageratina adenophora, a dicot, is a perennial herb that is not native to California; it was introduced from elsewhere and naturalized in the wild. Cal-IPC rating: Moderate

Ageratina adenophora is classified by the U.S. Federal Government as a NOXIOUS WEED. [USDA 2000]

Interactive Distribution Map


Observation Hotline
(observation details)



point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations



Bloom Period
Ageratina adenophora
© 2017 Keir Morse
Family: ASTERACEAE  
Genus: Ageratina
Communities: escaped cultivar

Wetlands: Occurs usually in non wetlands, occasionally in wetlands

Name Status:
Accepted by JEF + PLANTS

Alternate Names:
PLANTS: Eupatorium adenophorum
PLANTS: Eupatorium glandulosum
More information about  Ageratina adenophora
Photos on PlantID.net   /   Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

ITIS Original Publication citation

USDA PLANTS Profile (AGAD2)

Search the International Plants Names Index

Search efloras.org (Flora of North America)

website references from Google


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2018. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: Dec 16, 2018).