This paper reports the results of an inventory of the vascular plants from an Ozark Plateau Site in Ottawa County, northeastern Oklahoma. A total of 318 taxa in 219 genera and 81 families were collected. The families with the greatest number of species were the Asteraceae (with 37 taxa), Poaceae (36), and Fabaceae (31). Ninety-one species were annuals, three were biennials, and 224 were perennials. Fifty-eight species of woody plants were present. Thirty-three non-native species, representing 10.4% of the flora, were collected. Three species tracked by the Oklahoma Natural Heritage Inventory were found.