Exacum tetragonum var. tetragonum is a species in the Exacum genus. This name is accepted name for the species in the family Gentianaceae tribe Exaceae, . . This species is found in Assam, Bangladesh, Borneo, Cambodia, China South-Central, China Southeast, India, Jawa, Laos, Lesser Sunda Is., Malaya, Myanmar, Nepal, New Guinea, Northern Territory, Philippines, Sulawesi, Sumatera, Thailand, Vietnam, West Himalaya.