Berberis pumila is a species of shrub native to the Siskiyou Mountains of southwestern Oregon and northwestern California. It is found in open woods and rocky areas at an altitude of , often on serpentine soils.
Berberis pumila is evergreen, rarely more than 40 cm tall. It has compound leaves and dark blue berries.Greene, Edward Lee. Pittonia 2(10A): 161–162. 1891.
The compound leaves place this species in the group sometimes segregated as the genus Mahonia.Loconte, H., & J. R. Estes. 1989. Phylogenetic systematics of Berberidaceae and Ranunculales (Magnoliidae). Systematic Botany 14:565-579.Marroquín, Jorge S., & Joseph E. Laferrière. 1997. Transfer of specific and infraspecific taxa from Mahonia to Berberis. Journal of the Arizona-Nevada Academy of Science 30(1):53-55.Laferrière, Joseph E. 1997. Transfer of specific and infraspecific taxa from Mahonia to Berberis. Bot. Zhurn. 82(9):96-99.
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