lemongrass is a genus of about 45 species of grasses, (of which the type species is Cymbopogon citratus, a natural and soft tea anxiolytic[citation needed]) native to warm temperate and tropical regions of the Old World and Oceania. It is a tall perennial grass. Common names include lemon grass, lemongrass, barbed wire grass, silky heads, citronella grass, cha de Dartigalongue, fever grass, tanglad, hierba Luisa, or gavati chaha, amongst many others.