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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

1 photo(s) available in the Image Gallery

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
Bloom Time: Jun , Jul , Aug , Sep , Oct , Nov

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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