The basic process for making beer involves breaking a starchy grain down into sugars and then fermenting those sugars into alcohol with yeast. Malted barley is the most popular grain to use for beer, but beer can and is made from almost any grain.
Clockwise: Corn, Oats(panicles closed), Oats(panicles open), Rye, Rice, Turkish millet, Hungarian Millet, and Barley . MIddle section: Bearded wheat and Smooth wheat.
Image source: Grain, The circulating collection of the Print and Picture Collection, Free Library of Philadelphia