Riisi (viljariisi) – Oryza sativa

Several studies suggest that Oryza sativa was domesticated in China, but the exact time and place of its domestication are not known for certain. Remains of rice in China  have been dated to 6500 BC. From East Asia, rice was spread to South and  Southeast Asia and to other continents. Rice is cultivated throughout the humid tropics and in many subtropical and temperate areas with a frost-free period longer than 130 days. Rice is grown as far north as 53°N in Moho, northern China and as far south as 35°S in New South Wales, Australia. It grows at elevations ranging from sea level to at least 2400 m.