Brickellia desertorum is a species of flowering plant in the daisy family known by the common name desert brickellbush. It is native to the Mojave and Sonoran Deserts of California, Nevada, and Arizona, where it is a common member of the desert scrub flora. This is a densely branching shrub with hairy stems growing to 1.5 meters tall. The small, toothed, oval-shaped leaves are up to 1.2 centimeters long. The inflorescences at the end of stem branches contain clusters of flower heads, each about a centimeter long and lined with greenish, purplish, or yellowish phyllaries. At the tip of the head are 8 to 12 tubular disc florets. The fruit is a hairy cylindrical achene 2 or 3 millimeters long with a pappus of bristles.