A evergreen, native, cool season shrub growing 3 to 15 feet. A soft wood shrub with gray to ashy bark that can appear black with age or when wet. Thorny branches produce many greenishyellow to purple flowers from March to May. Seed are dry, smooth achenes, somewhat flat, with a long, bent and twisted, thread-like stalks. It resprouts vigorously from seeds when excessive moisture is available however it most common in dry and well-drained, sandy, gravelly, and rocky soils. Established in a small Southwest region of the United States.