Abstract: A species of the genus Thalictrum(Ranunculaceae), T.nepalense, is described as new from eastern Nepal. It is closely related to T.saniculiforme DC., differing from the latter in its taller 3-leaved and 3-branched stem, compound monochasia with only ultimate branches divaricate, albove clavate and below filiform stamen filaments, and anthers not apiculate at apex.