Sorghum is a genus of flowering plants in the grass family Poaceae. One species is grown for grain, while many others are used as fodder plants, either cultivated in warm climates worldwide or naturalized, in pasture lands. Sorghum is in the subfamily Panicoideae and the tribe Andropogoneae. It is an important crop worldwide, used for food, animal fodder, the production of alcoholic beverages, and biofuels. Most varieties are drought- and heat-tolerant, and are especially important in arid regions, where the grain is one of the staples for rural people. These varieties form important components of forage in many tropical regions.