Ambrosia chenopodiifolia is a species of ragweed known by the common names San Diego bursage and San Diego bur ragweed. It is native to Baja California, and southern California as far north as San Diego County, where it is a member of the coastal sage scrub plant community.
Ambrosia chenopodiifolia is a thickly branching shrub exceeding 3 meters in maximum height. The leaves are ovals up to 3 centimeters long and coated in white hairs. They are sometimes lobed.
Like other ragweeds it is monoecious, with each inflorescence bearing heads of pistillate (female) flowers below a cluster of staminate (male) flowers. The inflorescence is spiny, especially when in fruit. The fruit is a spherical, woolly bur about half a centimeter long covered in hooked spines.
- Ambrosia chenopodiifolia. NatureServe. 2012.
- Jepson Manual Treatment — Ambrosia chenopodiifolia
- USDA Plants Profile
- Ambrosia chenopodiifolia Photo gallery
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