Nagarmotha is also called Cyperus rotundus, and belongs to the family Cyperaceae. It is found throughout India. Cyperus is derived from Cypeiros, which means genus in ancient Greek, and the term rotundus means round (referring to the tuber) in Latin. It is known as nutgrass in the Southern states. It is a perennial, pestiferous weed with dark green, glabrous culms that emerge from underground tubers. The essential oil obtained from the tuber is used in making soap, perfumery, and insect repellent cream.
Nagarmotha (in Hindi) has other vernacular names like Chakranksha and Charukesara in Sanskrit; Purple nutsedge and nutgrass in English; Nagarmotha in Bengali; Nagaramothaya and Motha in Gujarati; Mushkezamin in Malaya; Saad Kufi in Urdu; Soad and Soadekufi in Arabic; Vomonniu in Burma; Korai and Muthakasu in Tamil; Tangahullu in Kannada; Muththann in Malayalam; Tungamuste in Telugu; Nagarmotha and Motha in Marathi.