Novel alkaloids, lythranine (III), lythranidine (VI), and lythramine (VII), were isolated from Lythrum anceps MAKINO. Lythranine, C₂₈H₃₇O₅N, was hydrolyzed with weak alkali to give lythranidine, C₂₆H₃₆O₄N. Lythranine on reaction with formalin gave lythramine, C₂₉H₃₇O₅N. Functional groups were investigated on these alkaloids and all of the O- and N-functions were clarified.