Ambrosia dumosa, White Bursage
Scientific Name: Ambrosia dumosa
Common Name: White Bursage
Also Called: Burro Weed or Burrobush (Spanish: Chicurilla, Estafiate, Ambrosia, Huizapol, Hierba del Burro, Chamizo)
Family: Asteraceae, Sunflower Family
Synonyms: (Franseria dumosa)
Size: Up to 3 feet.
Growth Form: Shrub, subshrub; erect, whitish color, rounded compact shrub; spinescent.
Leaves: Leaves light gray or whitish; soft and coarse hairs, dry looking, drought-deciduous, covered soft whitish hairs (tomentose); alternate, pinnately lobed usually 3 lobed, leaves bearing rigid flattened straight spines (spinescent); new leaves in spring.
Flower Color: Green; inconspicuous flowers, male and female flowers (monecious) intermixed (male flower heads with small stem (peduncle); fruit is a roundish or spherical spiny bur, seed is an achene.
Flowering Season: April to November; March to May and December in California.
Elevation: Up to 3,000 feet; below sea level and up to 4,500 feet in California.
Habitat Preferences: Common on rocky and sandy washes, dry plains and benches
North America & US County Distribution Map for Ambrosia dumosa.Recorded Range: In the United States, White Bursage is found in AZ, CA, NV and UT but primarily in southeast CA and western AZ. It also grows in northwest Mexico and Baja California. In Arizona it is found mostly in the western half of the state.
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: Like other Ragweed, White Bursage is wind pollinated and highly allergenic to people suffering from hay fever. Ambrosia dumosa, although common throughout both the Sonoran and Mojave deserts, is much more predominant in the Mojave Desert. It thrives in alkaline soils and has the ability to withstand very high surface temperatures for extended periods and often looks lifeless.
White Bursage is one of the dominant or co-dominant species in the Sonoran and Mojave Deserts, much more so in the Mojave Desert plant communities. White Bursage thrives in poor alkaline soil conditions and is often found in open bare areas with Creosote Bushes (Larrea tridentata).
White Bursage hybridizes with Cheesebush, Ambrosia salsola. Burro Weed and Burrobush are common names also used for other southwestern plants.
Also see in Southwest Desert Flora Canyon Ragweed, Ambrosia ambrosioides, Triangle-leaf Bursage, Ambrosia deltoidea, Hollyleaf Bursage, Ambrosia eriocentra, Burrobush, Ambrosia monogyra and Cheesebush, Ambrosia salsola.