Conyza canadensis

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Conyza canadensis
Cony cana.jpg
Photo taken by Kevin Robertson
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta - Flowering plants
Class: Magnoliopsida - Dicotyledons
Order: Asterales
Family: Asteraceae ⁄ Compositae
Genus: Conyza
Species: C. canadensis
Binomial name
Conyza canadensis
(L.) Cronquist
Cony cana dist.jpg
Natural range of Conyza canadensis from USDA NRCS Plants Database.

Common name: Canadian horseweed

Taxonomic notes

Synonyms: Erigeron canadensis Linnaeus; Conyza canadensis var. glabrata (A. Gray) Cronquist; C. canadensis var. pusilla (Nuttall) Cronquist; C. parva Cronquist; Erigeron canadensis var. pusillus (Nuttall) B. Boivin The Flora of North America.


A description of Conyza canadensis is provided in The Flora of North America.




C. canadensis has been observed to flower in June.[1]

Seed dispersal

This species is thought to be dispersed by wind. [2]

Seed bank and germination

C. canadensis was found in the seed bank of scrub, longleaf pine, and ecotone habitats in the western panhandle region of Florida. [3]


The following Hymenoptera families and species were observed visiting flowers of Conyza canadensis at Archbold Biological Station. [4]

Andrenidae: Andrena fulvipennis

Apidae: Epeolus carolinus

Halictidae: Sphecodes heraclei

Leucospididae: Leucospis affinis

Pompilidae: Episyron conterminus posterus

Sphecidae: Anacrabro ocellatus, Cerceris blakei, Ectemnius rufipes ais, Microbembex monodonta, Pluto rufibasis, Tachysphex apicalis, T. similis

Vespidae: Pachodynerus erynnis, Parancistrocerus salcularis rufulus, Stenodynerus beameri, S. fundatiformis, S. histrionalis rufustus

Conservation and management

Cultivation and restoration

Photo Gallery

References and notes

  1. Nelson, G. PanFlora: Plant data for the eastern United States with emphasis on the Southeastern Coastal Plains, Florida, and the Florida Panhandle. Accessed: 8 DEC 2016
  2. Kirkman, L. Katherine. Unpublished database of seed dispersal mode of plants found in Coastal Plain longleaf pine-grasslands of the Jones Ecological Research Center, Georgia.
  3. Ruth, A. D., et al. 2008. Seed bank dynamics of sand pine scrub and longleaf pine flatwoods of the Gulf Coastal Plain (Florida). Ecological Restoration 26:19-21.
  4. Deyrup, M.A. and N.D. 2015. Database of observations of Hymenoptera visitations to flowers of plants on Archbold Biological Station, Florida, USA.