The first part of the study involves the chemotaxonomic investigation of the genus Elettariopsis. Nine species have been confirmed in advance of an ongoing revision of the genus Elettariopsis in Peninsular Malaysia. However, some of the species have been wrongly identified based on their morphology and scent. Thus, the essential oils of the aerial and underground parts of six Malaysian Elettariopsis species were investigated and the variation in the distribution of their constituents was employed as a complementary tool in the taxonomy of species of this genus. The second part of the study...