Flowering plants (angiosperms) include the grass family, considered more important than any other family of flowering plants. The reason has to do with what humans around the world have eaten for centuries: the edible grains of these cultivated grasses, known as cereals, are (and have been) a basic food of most civilizations. Wheat, rice, and corn are the most extensively grown of all food crops, with other important cereals being barley, sorghum, oats, millet, and rye.