Ambrosia ambrosioides, Canyon Ragweed
Scientific Name: Ambrosia ambrosioides
Common Name: Canyon Ragweed
Also Called: Ambrosia Bursage, Ambrosia Leaf Bur (or Burr) Ragweed and Big Bursage (Spanish: Chicura).
Family: Asteraceae, Sunflower Family
Synonyms: (Franseria ambrosioides)
Size: Up to 6 feet.
Growth Form: Subshrub, shrub; tall, erect to sprawling, multiple stems, bristly white hairs, stems reddish-brown, stem scars typical.
Leaves: Dark green, dull; up to 8 inch, petiolate, mostly alternate, lanceolate or narrowly triangular; margins sharply toothed, hairy and sticky.
Flower Color: Dull yellow or yellowish-green; inconspicuous, male and female flowers; inflorescence a spike on terminal or lateral flower heads, fruit is a small fusiform burr with spines and hooks.
Flowering Season: March to May.
Elevation: Up to 4,500 feet.
Habitat Preferences: Riparian areas, dry arid areas, sandy and gravelly river bottoms.
Recorded Range: Canyon Ragweed is relatively rare in the United States occurring in California but mostly in Arizona. It is also native to southern Baja California and Mexico. In Arizona, Canyon Ragweed is found in central, southern and western parts of the state.
North America & US County Distribution Map for Ambrosia ambrosioides.
U.S. Weed Information: No data available.
Invasive/Noxious Weed Information: No data available.
Wetland Indicator: No data available.
Threatened/Endangered Information: No data available.
Comments: Canyon Ragweed is limited in distribution in the United States to Arizona and California. It is common throughout much of Arizona but is limited to San Diego County in California. Canyon Ragweed is one of several Ragweed species whose pollen causes hay fever and allergies in some people.
Also see in Southwest Desert Flora Triangle-leaf Bursage, Ambrosia deltoidea, White Bursage, Ambrosia dumosa, Hollyleaf Bursage, Ambrosia eriocentra, Burrobush, Ambrosia monogyra and Cheesebush, Ambrosia salsola.
Ambrosia ambrosioides has been used as an analgesic for respiratory problems by Western American indigenous peoples.
Pima Drug, Analgesic; Decoction of crushed roots taken by women for pains and menstrual hemorrhage.
Pima Drug, Cough Medicine; Poultice of warmed leaves applied to the chest to loosen a cough.
See ethno-botanical uses at Native American Ethnobotany, University of Michigan, Dearborn.