ruthbancroftgarden:

Berberis (Mahonia) fremontii

Some botanists put the mahonias into the genus Berberis, while others keep them as a separate genus. In any case, they are shrubs notable for their prickly leaves, yellow flowers and attractive fruits. In the case of Berberis fremontii, the fruits vary in color from yellow to purplish-red. Native to the southwestern U.S. and northern Mexico.

-Brian