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Ambrosia artemisiifolia var. artemisiifolia

Ambrosia artemisiifolia L. var. artemisiifolia

Annual Ragweed

Asteraceae (Aster Family)



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

This plant is a cause of hay fever, recognized by all who suffer the discomfiting allergy. (Niering)


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Plant Characteristics

Duration: Annual
Habit: Herb
Leaf Arrangement: Alternate , Opposite
Leaf Complexity: Simple
Leaf Shape: Elliptic , Lanceolate , Ovate
Leaf Pubescence: Glandular
Leaf Base: Cuneate
Size Notes: Up to about 5 feet tall, often much shorter.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.

Bloom Information

Bloom Color: Yellow , Green , Brown
Bloom Time: Jul , Aug , Sep , Oct


USA: CT , DC , GA , IL , MA , MD , ME , MN , MO , MS , NH , NY , PA , TN , VA , VT
Canada: NB , NL , NS , ON , PE , QC
Native Habitat: Forest Edge,Prairie/Meadow/Field


Conspicuous Flowers: yes

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


Record Modified: 2022-11-09
Research By: TWC Staff

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