2022 Mike Russler 2023 Steve Matson 2022 Mike Russler 2022 Mike Russler 2015 Richard Spjut 2022 Mike Russler 1999 David Cristiani 2019 Matt Berger 2022 Mike Russler 2011 Zoya Akulova 2008 Steve Matson 2004 Heath McAllister 2003 James M. Andre 1998 Larry Blakely 2019 Matt Berger 2023 Julia Markey 2023 Julia Markey 2022 Mike Russler 2022 Mike Russler 2022 Mike Russler 2022 Mike Russler 2022 Mike Russler 2023 Steve Matson 2023 Steve Matson 2023 Steve Matson 1998 Larry Blakely
Ambrosia dumosa is a shrub that is native to California, and also found elsewhere in western North America.
[Wikipedia] Range: Ambrosia dumosa, the burro-weed or white bursage, a North American species of plants in the family Asteraceae. 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) (contributed by Mary Ann Machi)
[Wikipedia] Description: 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 the population grows from Joshua Tree, CA to Las Vegas, NV. (contributed by Mary Ann Machi)
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Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2023. Berkeley, California:The Calflora Database
[a non-profit organization].Available: