Limnocharis flava (English: yellow sawah lettuce, yellow burr head or yellow velvetleaf, Indonesian: genjer, Javanese: gènjèr, Lao phak khan chong, Tagalog: cebolla de chucho, Thai: ตาลปัตรฤาษี, khmer: ត្រកៀតប៉ោង, Vietnamese: kèo nèo or cù nèo) is a species of aquatic flowering plant which is native to Mexico, Central America, South America, Cuba, Haiti and the Dominican Republic but widely naturalized in southern and southeastern Asia (India, Sri Lanka, Assam, Cambodia, Burma, Thailand, Vietnam, Indonesia, Malaysia and southern China (Guangdong, Yunnan)).