Ceanothus greggii, with the common name desert ceanothus, is a species of shrub in the buckthorn family, Rhamnaceae.
It is native to the Southwestern United States, Arizona, California, New Mexico, Texas, and northern Mexico. It grows in desert scrub, sagebrush, chaparral, and other dry habitats such as inland mountain slopes, at elevations of 1,000 m (3,300 ft) to 2,300 m (7,500 ft).It was named for its collector Josiah Gregg, who found the plant in 1847 at the site of the Battle of Buena Vista ...