Native Plants

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Brundage, Stephanie

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

66 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: U.S. Army Corps of Engineers. (2023). 2022 National Wetland Plant List, version 3.6. U.S. Army Engineer Research and Development Center, Vicksburg, MS. https://wetland-plants.usace.army.mil/. 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: 0000-00-00
Research By: TWC Staff

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