Among monocots forming the family of Gramineae some grasses produce essential oils that are a valuable source for the flavor industry. Two grasses are known for their industrial potential for essential oil production: Vetiveria zizanioides Stapf, which has been the subject of a monograph in the series Medicinal and Aromatic Plants-Industrial Profiles (Maffei 2002) and Cymbopogon, which is the subject of this book and which updates the monograph edited by Kumar et al. (2000).