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Plant Database

Search for native plants by scientific name, common name or family. If you are not sure what you are looking for, try the Combination Search or our Recommended Species lists.

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Conyza canadensis var. pusilla (Canadian horseweed)
Cressler, Alan

Conyza canadensis var. pusilla

Conyza canadensis (L.) Cronquist var. pusilla (Nutt.) Cronquist

Canadian Horseweed

Asteraceae (Aster Family)

Synonym(s): Conyza parva, Erigeron canadensis var. pusillus, Erigeron pusillus, Leptilon pusillum

USDA Symbol: COCAP3

USDA Native Status: L48 (N), HI (I), PR (N), VI (N)

Glabrous stems and red-tipped phyllaries distinguish this variety.

 

From the Image Gallery

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Plant Characteristics

Duration: Annual , Biennial
Habit: Herb
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 , Yellow , Purple
Bloom Time: Jan , Feb , Mar , Apr , May , Jun , Jul , Aug , Sep , Oct , Nov , Dec
Bloom Notes: White to pale purplish small ray flowers, yellow disc flowers. Phyllaries red-tipped. Flowers mostly summer through fall. May flower year-round in the right conditions.

Distribution

USA: AL , AR , AZ , CT , DE , FL , GA , IN , KY , LA , MA , MD , MO , MS , NC , NJ , NY , OH , OK , PA , RI , SC , TN , TX , VA

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

Metadata

Record Modified: 2022-12-07
Research By: Joseph A. Marcus

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