Hygroryza (watergrass) is a genus of Asian plants in the grass family. Species The only known species is Hygroryza aristata, (Asian watergrass) native to China (Fujian, Guangdong, Hainan, Taiwan, Yunnan), Bangladesh, Cambodia, India (Maharashtra, Karnataka, Assam, etc.), Laos, Malaysia, Myanmar, Nepal, Pakistan, Sri Lanka, Thailand, Vietnam. formerly included Hygroryza ciliata - Leersia hexandra