Taxon  Report   2325 
Conyza canadensis  (L.) Cronquist  (not an active name)
Canada horseweed,  Canadian horseweed
Conyza canadensis
© 2009 Zoya Akulova
More photos from
CalPhotos / Calflora
Conyza canadensis, a dicot, is an annual herb that is native to California and is also found elsewhere in North America and beyond.

Interactive Distribution Map

Observation Hotline
(observation details + photos)

point, line, or polygon

Plant Characteristics
and Associations
Conyza canadensis
© 2005 Luigi Rignanese
Genus: Conyza
weed, characteristic of disturbed places, wetland-riparian
Habitat: disturbed
Name Status:
Accepted by PLANTS + JM93
ICPN accepted name: Erigeron canadensis
NOTE: Conyza canadensis is not an active name in the Calflora species table.
More information about  Conyza canadensis
Nursery / seed vendor availability from CNPLX
Commercial availability unknown.
Landscaping information from Calscape
Photos on CalPhotos / 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)

Search the Lady Bird Johnson Wildflower Center

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: Jul 20, 2018).

The information on this page comes from diverse sources. None of the links are sponsored.