The aim of the study is to determine the plant-covered area, the botanical compositions and the forage yield in a natural rangeland. A case study was conducted of Daridere Watershed in Isparta district of Southern Turkey. Sampling was carried out in the north and south aspects in 2011. "Line intercept" and "quadrat" methods were used in order to determine the rangeland flora of the case study area. 190 plant taxa belonged to 41 families; out of which 36 taxa of Fabaceae were determined, while 21 and 17 taxa were determined in Caryophyllaceae and in Asteraceae respectively. The plant-covered area was found as nearly 27%. The botanical composition of rangelands' taxa is approximately 48% Poaceae, 23% Fabaceae and 29% of other families. The dry forage and underground biomass yields were calculated as 368.76 kg/da and 545.03 kg/da respectively. The case study area of rangeland condition was established as "moderate". Results of the study were also discussed based on rangeland management.