Abstract

• Tadehagi triquetrum (L.) Ohashi is one of the medicinal plants under the family Fabaceae and it is well known as “laukthay” in Myanmar. This plant was collected from Myitkyina Township, Kachin State. Morphological and microscopical characters, phytochemical constituents and antimicrobial activities were investigated so as to certain their correct identification. The plant was perennial erect shrub, woody and reddish green angular branches with hairs on the angles. The corolla were papilionaceous and the fruits were jointed. In microscopical study, paracytic stomata were found on both surfaces. The vascular bundle was collateral type and endarch. The powdered leaves were tested for the phytochemical constituents and observed that alkaloids, flavonoids, phenolic compounds, steroids, saponins, tannins, glycosides and carbohydrates were present. The alkaloids, flavonoids, terpenoids, phenolic compounds, steroids, saponins, tannins, glycosides and carbohydrates were present in powdered root. In antimicrobial activity, the various solvent extracts of leaves and roots were tested by agar well diffusion method. The ethyl acetate extract of leaves and the methanol extract of roots showed the highest activity.