A perennial, evergreen shrub growing 2 to 6 feet. Thread like leaves are deciduous, silver color, and aromatic. Flowers are yellow blooming in August thru September. The small fruit are achenes. Reproduces from small white seeds. The sprawling shrub is used for landscaping as background brush and against wind erosion. It grows in deep sands, dunes, sometimes calcareous soils and is very drought tolerant. Found in desert regions in the southwestern United States.