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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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Ambrosia trifida var. trifida

Ambrosia trifida L. var. trifida

Great Ragweed

Asteraceae (Aster Family)

Synonym(s): Ambrosia trifida var. integrifolia


USDA Native Status: L48 (N), CAN (N)


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Plant Characteristics

Duration: Annual
Habit: Subshrub
Leaf Arrangement: Opposite
Leaf Shape: Deltoid , Elliptic , Ovate
Leaf Base: Cuneate , Truncate
Size Notes: Up to about 12 feet tall, often shorter.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.

Bloom Information

Bloom Color: Green
Bloom Time: Aug , Sep


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

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.

Additional resources

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


Record Modified: 2022-10-12
Research By: TWC Staff

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