Buckwheat is the seed of a plant called fagopyrum esculentum its related to rhubarb not wheat rye or barley and despite the confusing name buckwheat is gluten free wholegrain source of protein naturally gluten free naturally low in fat buckwheat is the seed of a plant called fagopyrum esculentum its related to rhubarb not wheat rye or barley and despite the confusing name buckwheat is gluten free wholegrain source of protein naturally gluten free naturally low in