Calflora
Taxon  Report   11667    
Erigeron canadensis  L.
Canada horseweed
Erigeron canadensis
© 2005 Luigi Rignanese
Photos from
CalPhotos / Calflora
Erigeron canadensis
© 2010 Louis-M. Landry
Erigeron canadensis
© 2009 Neal Kramer
Erigeron canadensis, a dicot, is an annual herb that is native to California, 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



Bloom Period
Erigeron canadensis
© 2018 Brian Charles
Communities: weed, characteristic of disturbed places, wetland-riparian

Wetlands: Occurs usually in non wetlands, occasionally in wetlands

Habitat: disturbed

Name Status:
Accepted by JEF

PLANTS accepted name:
Conyza canadensis var. canadensis

Alternate Names:
ICPN: Conyza canadensis
ICPN: Conyza canadensis var. canadensis
More information about  Erigeron canadensis
Nursery / seed vendor availability from CNPLX
Commercial availability unknown.
Landscaping information from Calscape
Photos on PlantID.net   /   Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

USDA PLANTS Profile (COCAC3)

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: http://www.calflora.org/   (Accessed: Oct 20, 2018).

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