Leucas zeylanica, commonly known as Ceylon slitwort, is a small, terrestrial, herbaceous, annual, erect or sometimes tufted, hispid and aromatic plant of the subfamily Lamioideae of family Lamiaceae. It is native to Tropical Asia and Malaya. Botanical synonyms include Leucas bancana Miq., Phlomis zeylanica Linn., and Spermacoce denticulata Walp. It is also known as ගැටතුඹ (geta-tumba) in Sinhala, halkusha in Bengali, guldora in Punjabi, kulnnphul in Gujarati, goma madhupati in Hindi, kubo in Sindhi, bhutamari in Oriya, bahuphul in Marathi, thumbai in Tamil, thumbe in Kannada, thummi in Telugu, and thumba in Malayalam.