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