abstract the volatile constituents of mentha longifolia (l.) huds. var. asiatica (boriss.) rech. f. were isolated by steam distillation and analyzed by gc and gc/ms. the major constituents of the leaf oil were piperitone (67.6%), isomenthone (6.6%) and cis-piperitol (4.2 %), while the flower oil contained piperitone (55.7%), carvone (16.2%) and pulegone (4.1%). key word index: mentha longifolia var. asiatica lamiaceaeessential oil compositionpiperitone1,8-cineole