canyon ragweed Asteraceae (Compositae) Ambrosia ambrosioides (Cav.) Payne Listen to the Latin symbol: AMAM2 Other Fact Sheets
Leaf: Alternate, simple, evergreen, elongated triangular to lance-shaped, coarse serrate or toothed, green above and below but covered in pale pubescence, drought deciduous.
Flower: Dull yellow-green, in small clusters borne on a spike, present in late winter to early spring.
Fruit: A spiny bur with slender spines, 1 inch long.
Twig: Reddish brown with white pubescence, stout, brittle, narrow leaf scars.
Bark: Reddish brown and becoming smooth and shiny.
Form: A gangling, sprawling shrub to 6 feet.
leaf flower fruit twig bark form1 map
Additional Range Information:
Ambrosia ambrosioides is native to North America.
Range may be expanded by planting.
See states reporting canyon ragweed.
External Links:
USDA Plants Database
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Photos and text by: John Seiler,
Edward Jensen, Alex Niemiera,
and John Peterson
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