The potato's a starchy, tuberous crop from the perennial Solanum tuberosum of the Solanaceae family (also known as the nightshades). The word potato may refer to the plant itself as well. In the region of the Andes, there're some other closely related cultivated potato species. Potatoes are the world's fourth largest food crop, following rice, wheat, and maize. Wild potato species occur from the United States to Uruguay and Chile. Genetic testing of the wide variety of cultivars and wild specie… (More on Potatoes)