Torenia gracilis, a species closely similar to Bonnaya antipoda, was published by Bentham in Wallich's Numerical List without description and was later synonymised under B. verbenifolia, now a synonym of B. antipoda. In this paper, the nomenclature of T. gracilis Benth. (nom. inval.) is discussed and this taxon is treated within Bonnaya as B. gracilis sp. nov. with a detailed description and comments on its taxonomic identity.