Sandeo Reserve Forest is located in the north of Pithoragarh district of Kumaun region between 29º45'32" to 29º52' 10" N latitude and 80º07'30" to 80º17'56" E longitudes and covers approxi-mately 30 sq. km. area. An extensive floristic survey was carried out for documentation of angiosperm diversity in this reserve forest between 2002 and 2007. A total of 471 species, 346 genera and 107 families were found in this area. Poaceae, Asteraceae, Fabaceae, Orchidaceae, Lamiaceae and Rosaceae were dominant families and Erigeron, Polygonum and Rubus were the largest genera with six species each. Maximum number of species were found in the altitudinal zone of below 1800 m.