Ambrosia trifida L. - Great Ragweed


 

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Ambrosia trifida - (image 1 of 4)

 

Taxonomy

Family: Asteraceae

Habitat

Thrives in disturbed habitats, waste ground. Probably native to floodplains

Associates

 

Distribution

All of the continental US except NV

Morphology

Herbaceous annual to 2 m or taller. Leaves opposite, simple or palmately 3-5 lobed. Plants monoecious, with the pistillate heads borne below staminate heads in the axils of leaves or bracts. Staminate heads in racemiform inflorescences.

Notes

Flowers late July to September

Wetland Indicator: Facultative +

The pollen of this plant and its congener A. artemisiifolia L. is largely responsible for late summer allergies.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY

 

Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.

 


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Michael Hough 2004