Oryza is a genus of plants in the grass family. It includes the major food crop rice (species Oryza sativa and Oryza glaberrima). Members of the genus grow as tall, wetland grasses, growing to 1–2 m tall; the genus includes both annual and perennial species. One species, Asian rice (O. sativa), provides 20% of global grain and is a food crop of major global importance. The species are divided into two subgroups within the genus. Species many species now regarded as better suited to other genera: Echinochloa Leersia Maltebrunia Potamophila Prosphytochloa Rhynchoryza