Ambrosia dumosa, the burro-weed or white bursage, a North American species of plants in the sunflower family. It is a common constituent of the creosote-bush scrub community throughout the Mojave desert of California, Nevada, and Utah and the Sonoran Desert of Arizona and northwestern Mexico (Baja California, Baja California Sur, Sonora, Chihuahua).
Ambrosia dumosa has been studied to determine allelopathic interactions with creosote bush, Larrea tridentata, which produces a chemical that inhibits the growth of A. dumosa. Other studies have suggested that A. dumosa roots produce a chemical that causes them to grow away from conspecific roots, preventing competition for water resources. In addition to burrow-weed, A. dumosa is also commonly called bur sage, burro weed, and burro bush.
Ambrosia dumosa, a form of ragweed, is a highly branched shrub 20 to 90 cm in height. The younger stems are covered with soft gray-white hairs. Approximately obovate leaves are 1 to 3 times pinnately compound or deeply lobed and generally clustered on short branches. The leaves are 0.5 to 4 cm long and also covered in soft gray-white hairs.
Its inflorescence is yellow with staminate and pistillate headson a single plant (monoecious). Staminate heads have many flowers and are 3 to 5 mm in diameter with a 5 to 8 lobed involucre. Pistillate heads are 2 flowered and lack corollas.
Ambrosia dumosa has spherical bur-like fruits ranging in color from golden to purple to brown. Along with microscopic hairs, the fruit has 12 to 35 flat and straight spines which are 5 to 9 mm in length and scattered over the surface.
Ambrosia dumosa becomes dormant during drought, losing all of its leaves to prevent water loss by transpiration; drought deciduous. During this time it can still be recognized by the presence of longitudinal stripes on smaller stems.
Like other types of Ambrosia this is a ragweed, wind blown pollen from burro-weed can cause serious allergic reactions. Increasing cases in Mojave Desert as population grows from Joshua Tree, CA to Las Vegas, NV.
- Tropicos, Ambrosia dumosa (A. Gray) W.W. Payne
- The Plant List, Ambrosia dumosa (A.Gray) W.W.Payne
- Flora of North America Vol. 21 Page 13 Bursage Ambrosia dumosa (A. Gray) W. W. Payne, J. Arnold Arbor. 45: 422. 1964.
- Biota of North America Program 2014 county distribution map
- Calflora taxon report, University of California, Ambrosia dumosa (A. Gray) Payne Burrobush, burro weed, white bursage
- Tropicos, specimen listing for Ambrosia dumosa (A. Gray) W.W. Payne
- Allen A.Schoenerr, Allen A. 1992. A Natural History of California. Berkeley: University of California Press. ISBN 0-520-06922-6