Berberis gagnepainii, or Gagnepain's barberry, is a species of flowering plant in the family Berberidaceae, first described in 1908.Schneider, Camillo Karl. 1908. Bulletin de l'Herbier Boissier Ser. II. viii. 196 It is endemic to China, known from Guizhou, Hubei, Sichuan, and Yunnan Provinces.Flora of China, Vol. 19 Page 737 湖北小檗 hu bei xiao bo Berberis gagnepainii
Berberis gagnepainii is a shrub up to 2 m tall. The leaves are evergreen, simple, lanceolate to elliptical, toothed, the teeth tipped with short spines. The leaves and flowers are borne on short shoots in the axils of 3-parted spines. The inflorescence is a fascicle of 2-15 yellow flowers. The berries are glaucous (waxy), dark blue-black and oblong. Its habitats include montane thickets as well as forest margins and understories.
Its name is dedicated to François Gagnepain.
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