Berberis paxii is a shrub in the Berberidaceae described as a species in 1901.Fedde, Friedrich Karl Georg. 1901. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 31: 113-115 description in Latin, commentary in German, line drawing as illustrationStandley, Paul Carpenter. 1922. Contributions from the United States National Herbarium 23(2): 271Marroquín, Jorge S. & Laferrière, Joseph E. 1997. Journal of the Arizona-Nevada Academy of Science 30(1): 54 It is endemic to the State of Hidalgo in eastern Mexico.CONABIO. 2009. Catálogo taxonómico de especies de México. 1. In Capital Nat. México. CONABIO, Mexico D.F.
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