Wildflowers of Tucson, Arizona
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Ambrosia ambrosioides - Ambrosia Leaf Burr Ragweed (Canyon Ragweed) Ambrosia ambrosioides - Ambrosia Leaf Burr Ragweed (Canyon Ragweed)
Scientific Name: Ambrosia ambrosioides
Common Name: Ambrosia Leaf Burr Ragweed, Canyon Ragweed
Flower Color: Dull yellowish
Plant Type: Subshrub, Shrub, Perennial
Height: To 39 inches (1 m) tall
Date Observed: March 13, 2004
Notes: The allergenic flowers are in terminal flower spikes and are followed by spiny, bur-like green fruit. The leaves are toothed and elongated triangular to lanceolate. The stems are red-brown. This large, rangy, native plant is found growing in canyons.
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