Its pretty much a wild rice that can come up volunteer or you can get it in your rice seed. It basically comes from not rotating the crops enough and farmers get docked for having it when they take their rice to the mills. There are different varieties of it here in arkansas, and it can cross with conventional rice. Arkansas has had it for a while now. In the Delta Farm Press, they were talking about how it is just now showing up in California and how big of a deal they are making about it.