A novel flavanone, leachianone A, with a lavandulyl residue was isolated from the roots of Sophora leachiano in addition to sophoraflavanone G. The structure was determined to be 5,7,4'-trihydroxy-8-lavandulyl-2'-methoxyflavanone by means of NMR ('H-'H and lH--13C COSY) spectral analysis. The structural relationships of leachianone A with isokurarinone and vexibidin, and of sophoraflavanone G and kushenol F with nor-kurarinone and vexibinol are also discussed.