Taxon  Report   266 
Alternanthera philoxeroides  (C. Martius) Griseb.
Alligator weed,  Alligatorweed
Alternanthera philoxeroides
© 2001 CDFA
Click on a photo to see it bigger.
Alternanthera philoxeroides
© 2001 CDFA
Alternanthera philoxeroides
© 2001 CDFA
Alternanthera philoxeroides, 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 high - ALERT (plant profile / CalWeedMapper).

Interactive Distribution Map

Observation Hotline
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point, line, or polygon

one or more occurrences
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Plant Characteristics
and Associations

Bloom Period
Alternanthera philoxeroides
© 2001 CDFA
Genus: Alternanthera
Wetlands:Occurs almost always under natural conditions in wetlands [U.S. Fish & Wildlife Service.]
Distribution by County 

Add an Observation of  Alternanthera philoxeroides

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

PLANTS: Achyranthes philoxeroides
More information about  Alternanthera philoxeroides
Photos on CalPhotos / Google Images
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 21, 2016).

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