Taxon  Report   117 
Ageratina adenophora  (Sprengel) R. King & H. Robinson
Sticky snakeroot,  Thoroughwort
Ageratina adenophora
© 2015 Richard Spellenberg
Click on a photo to see it bigger.
Ageratina adenophora
© 2015 Barry Breckling
Ageratina adenophora
© 2009 Thomas Stoughton
Ageratina adenophora, a dicot, is a perennial herb that is not native to California; it was introduced from elsewhere and naturalized in the wild.
It is an invasive plant. The California Invasive Plant Council classifies its potential impact on native ecosystems as moderate (plant profile / CalWeedMapper).

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

Interactive Distribution Map

Observation Hotline
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point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations

Bloom Period
Ageratina adenophora
© 2009 Neal Kramer
Genus: Ageratina
escaped cultivar
Distribution by County 

Add an Observation of  Ageratina adenophora

Name Status:
Accepted by TJM2 + PLANTS + JM93
Alternate Names:
(according to)

PLANTS: Eupatorium adenophorum
PLANTS: Eupatorium glandulosum
More information about  Ageratina adenophora
Photos on CalPhotos / Google Images
Photos and ID tips from

Jepson eFlora

Records from the Consortium of California Herbaria

Original Publication citation (ITIS)


Search the International Plants Names Index

Search (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]. 2016. Berkeley, California: The Calflora Database [a non-profit organization].
Available:   (Accessed: Oct 27, 2016).

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