Native Plants

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Stone, Robert L.

Conyza canadensis var. canadensis

Conyza canadensis (L.) Cronquist var. canadensis

Canadian Horseweed

Asteraceae (Aster Family)

Synonym(s): Erigeron canadensis, Leptilon canadense

USDA Symbol: COCAC3

USDA Native Status: L48 (N), AK (I), HI (I), CAN (N), SPM (N)

From the Image Gallery

60 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Annual
Habit: Herb
Leaf Retention: Deciduous
Leaf Shape: Linear , Oblanceolate
Size Notes: Up to about 6 feet tall. Occasionally up to almost 12 feet tall.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.

Bloom Information

Bloom Color: White
Bloom Time: Jul , Aug , Sep , Oct

Distribution

USA: AK , AL , AR , AZ , CA , CO , CT , DC , DE , FL , GA , HI , IA , ID , IL , IN , KS , KY , LA , MA , MD , ME , MI , MN , MO , MS , MT , NC , ND , NE , NH , NJ , NM , NV , NY , OH , OK , OR , PA , RI , SC , SD , TN , TX , VA , VT , WA , WI , WV , WY
Canada: AB , MB , NB , NL , NS , NT , ON , PE , QC , SK

Growing Conditions

Soil Moisture: Dry , Moist

National Wetland Indicator Status

Region:	AGCP	AK	AW	CB	EMP	GP	HI	MW	NCNE	WMVE
Status:	FACU	UPL	FACU	FACU	FACU	FACU	UPL	FACU	FACU	FACU

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Conyza canadensis var. canadensis in USDA Plants
FNA: Find Conyza canadensis var. canadensis in the Flora of North America (if available)
Google: Search Google for Conyza canadensis var. canadensis

Metadata

Record Modified: 2022-12-06
Research By: TWC Staff

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