Wild rice (also called Canada rice, Indian rice, and water oats) is four species of grasses forming the genus Zizania, and the grain which can be harvested from them.
The grain was historically gathered and eaten in both North America and China. While it is now something of a delicacy in North America, the grain is no longer eaten in China, where the plant's stem is used as a vegetable.
The species most commonly harvested as grain is the annual species Zizania palustris. Native Americans and non-Indians harvest wild rice by canoeing into a stand of plants, and bending the ripe grain heads with wooden sticks called knockers, so as to thresh the seeds into the canoe.