In PartXIIIof this series (Shellard, Phillipson and Gupta 1968a) a report was given of the variation on the pattern of alkaloids present in the leaves of Mitragyna parvifolia, (Rox b.) Korth. obtained from different geographical sources in India. We have now examined leaves of the species obtained from Burma, Cambodia and Ceylon and again find a variation in the pattern of alkaloids present.