Broom, Turpentine, Snake or Match Weed (Guterrezia sarothrae).
This is a secondary selenium accumulator that has also been associated with abortion in cattle and sheep, but not horses, grazing it. It is a perennial invasive plant with a woody base from which the closely grouped branching stems arise each spring. Often it is an evergreen shrub in the milder climates of the southwestern states. The leaves are alternate, linear, and glabrous. It has many yellow flower heads, usually located in clusters at the ends of the branches. A given head will have no more than three to eight yellow ray flowers, and three to eight disc flowers. The pappus is composed of several to many oblong scales.
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