Taxon  Report   2324    
Conyza bonariensis  (L.) Cronquist  
(no longer an active name)
Asthmaweed,  Flax leaved fleabane, Horseweed, South american horseweed
Conyza bonariensis
© 2009 Neal Kramer
Photos from
CalPhotos / Calflora
Conyza bonariensis, a dicot, is an annual herb that is not native to California; it was introduced from elsewhere and naturalized in the wild.

Interactive Distribution Map

Observation Hotline
(observation details)

point, line, or polygon

Plant Characteristics
and Associations

Bloom Period
Conyza bonariensis
© 2007 Luigi Rignanese
Genus: Conyza
Name Status:
Accepted by PLANTS

ICPN accepted name:
Erigeron bonariensis

Alternate Names:
PLANTS: Erigeron bonariensis
PLANTS: Erigeron crispus
PLANTS: Erigeron linifolius
. . .
NOTE: Conyza bonariensis is no longer an active name.
More information about  Conyza bonariensis
Nursery / seed vendor availability from CNPLX
Commercial availability unknown.
Photos on Google Images
UC Integrated Pest Management Weed Photo Gallery
(profile of this plant as an agricultural weed)

Records from the Consortium of California Herbaria

ITIS Original Publication citation


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]. 2018. Berkeley, California: The Calflora Database [a non-profit organization].
Available:   (Accessed: Dec 14, 2018).

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