Ambrosia chenopodiifolia is a species of ragweed known by the common names San Diego bursage and San Diego bur ragweed.[1] It is native to the Mexican states of Baja California and Baja California Sur (Comondu Municipality),[2] as well as to Orange[3] and San Diego Counties it int US State of California.[4] 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.[4]
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.[4]
This species is host to the following insect induced gall:Aceria franseriae bead leaf gall Mite.