An intriguing all-green thorny shrub, reminiscent of allthorn except that the leaves and branches are all opposite. I only observed one cluster of this shrub, in a dry rocky side canyon off of the main Right Hand Canyon on the Preserve.
Adolphia is a genus of shrubs in the buckthorn family containing only two species. These are rigid, thorny, flowering bushes. Adolphia californica, the California prickbush or California spineshrub, is native to southern California and northern Mexico. Adolphia infesta, the junco, is found in Texas, New Mexico, and northern Mexico. This genus is named for the French botanist Adolphe-Théodore Brongniart.