Citronella is a perennial grass, which belongs to the Poaceae family. The two most commonly known varieties of citronella grass are Cymbopogon nardus and Cymbopogon winterianus. In trade, C. nardus and C. winterianus are popularly known as Java citronella (superior) and Ceylon citronella (inferior), respectively. Other names for C. nardus variety are citronella oil (India); serai wangi (Malaysia); nardus grass, and for C. winterianus variety is Java grass (Brazil).