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Ethno botanical study was done in Aldai and Kaptumo divisions in Nandi district situated on the western part of Rift valley province. It borders Kakamega district to the north–west, Uasin Gishu district to the north and East, Kericho district to the south-east, Kisumu to the south east and Vihiga district to the west (Anon, 1997-2002). With forest reserves occupying 54,487.4 hectares. The district lies within latitudes 00 and 0034” North and Longitudes 340 44” and 350 25” East. It occupies an area of 2,873 km2 with forest reserves occupying 56,019 hectares. South nandi forest covering an area of 1800ha. It has an altitude of 1700-2000m (Kigomo, 1991). It has five administrative divisions. Aldai division occupies 567km2 and sub-divided into twelve locations and 38 sublocations (Kigomo, 1991). Aldai division has the highest population density of 382 people in 567 km2 in 2001 and the same trend is expected to increase with a population growth rate of 2.9%. These people still perform herbal treatments for curing general disorders. For them, use of herbs is the cheapest way for curing various health disorders. A review of literature reveals that much work has been done on ethnomedicinal plants in Kenya and other parts of the world (Jain, 1991; Negi et al., 1993; Ole Sankan, 1995: Singh et al., 1997: Karehed and Odhult, 1997; Bussmann et al., 2006). But still there are some tribal pockets which could be surveyed for the search of new traditional medicines. We report the ethnomedicinal plants of Nandi district for the first time. Ethnobotanical survey was done in different parts of Aldai division for search of new traditional herbal medicines in Nandi south …