Vasilis Teodoridis:
Betulaceae | Corylus
1. Corylus ferox Wallich; Pl. Asiat. Rar. 1: 77. 1830.
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Trees to 20 m tall; trunk to 30 cm d.b.h.; bark dark gray or gray; fissured. Branchlets purplish brown; pubescent; sometimes stipitate glandular; glabrescent; with scattered; minute lenticels. Petiole 1-3.5 cm; densely pilose when young; glabrescent; leaf blade ovate-oblong; obovate-oblong; obovate; or elliptic; 5-15 x 3-9 cm; papery; abaxially bearded in axils of lateral veins; pilose and sparsely glandular; adaxially sparsely pilose especially along impressed midvein when young; base very obliquely rounded or subcordate; margin sharply and doubly mucronate serrate; apex long acuminate to caudate-acuminate; lateral veins 8-14 on each side of midvein. Male inflorescence ca. 2 cm; bracts broadly ovate; tomentulose; apex acute to acuminate; anthers purple. Female flowers 4-6 in a cluster; bracts campanulate; densely pubescent; sometimes stipitate glandular; with laciniate segments forming branching; pungent spines. Nut ovoid-globose; subcompressed; 1-1.5 cm in diam.; apex pubescent. Fl. May-Jul; fr. Jul-Sep. 2n = 22.
Forests on mountain slopes; 1500-3800 m. SE Gansu; Guizhou; W Hubei; Ningxia; Shaanxi; E and SW Sichuan; Xizang; Yunnan [Bhutan; NE India; N Myanmar; Nepal; Sikkim].