Lemon Grass or Lemongrass -- Asian Herbs Today is FOOD ENCYCLOPEDIA DIRECTORY Lemon Grass Lemon Grasses Scientific classification Kingdom:Plantae Division:Magnoliophyta Class:Magnoliopsida Order:Poales Family:Poaceae Genus:Cymbopogon Species More than 50, see textLemon Grass or lemongrass is a perennial herb used in Asian (particularly Thai, Khmer and Vietnamese) and Caribbean cooking.