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![Asteraceae : Conyza canadensis](https://openprairie.sdstate.edu/nativeplant/1181/thumbnail.jpg)
Asteraceae : Conyza canadensis
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Family Name
Asteraceae
Common Name
Canadian horseweed
Native American Name
Lakota: čhaŋȟlóǧaŋ waštémna iyéčheča
Description
Conyza canadensis is an annual, herbaceous plant growing from 0.3 10 to 1.5 m tall, mostly simple or branching above if injured, with sparsely hairy stems. The simple, alternate leaves are sessile, narrowly oblanceolate to linear 2–10 cm long and generally <1 cm wide, with entire to coarsely toothed margins. The leaves grow in a spiral up the stem and the lower ones often wither early. The inflorescence is a terminal cluster of flower heads 1 cm in diameter, with an involucre, of overlapping bracts, that is 3-4 mm long and green. Twenty to 30 ray flowers with white to pale purple ligules and a few yellow disc florets in the center. The fruit are hairy achenes with an abundant pappus. Horseweed is a weed in open cultivated and disturbed ground flowering from June through September throughout South Dakota.
Horticulture Notes
This plant is not recommended for horticultural uses.
![Asteraceae : Conyza canadensis](https://openprairie.sdstate.edu/nativeplant/1181/thumbnail.jpg)
Additional Notes
Canadian horseweed may become weedy or invasive in some areas or habitats.