Burrobush, Burro Weed, White Bursage

Ambrosia dumosa


Burrobush, Burro Weed, White Bursage, Ambrosia dumosa

Color: Green to brown

Common name: Burrobush, Burro Weed, White Bursage

Latin name: Ambrosia dumosa

Family: ASTERACEAE

Height: 8-35 inches

Burrobush, Burro Weed, White Bursage, Ambrosia dumosa

Description: A much-branched shrub that is softly gray-white. The stems are covered with dense, fine greyish white hairs. The plant has both male and female flowers on the same plant.

Leaf: The teardrop-shaped leaf is generally ± clustered on short branches and are also covered with dense, fine, greyish white hairs.

Range: East of Sierra Nevada, Desert

Habitat: Creosote-bush scrub, Joshua Tree Woodland

Elevation: < 1600 m.

Flowering time: Feb–Jun, Sep–Nov

Notes: Ambrosia dumosa, a dicot, is a shrub that is native to California and is also found outside of California, but is confined to western North America. A. 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 5-9 mm in length and scattered over the surface. A. dumosa becomes dormant during drought, losing all of its leaves to prevent water loss by transpiration. Distribution outside California: to sw Utah, Arizona, nw Mexico. This plant was photographed April 11, 2011 near Yermo, Calif. with a Canon EOS 7D and 50mm lens.

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