legume ).
The mature seeds of the principal food beans, except soybean s, are similar in composition, though they differ widely in eating quality. Rich in protein and providing moderate amounts of iron and vitamins B 1 and B 2 , fresh or dried beans are used worldwide for cooking. Varieties differ greatly in size, shape, colour, and tenderness of the immature pods. The common string, snap, or green bean ( Phaseolus vulgaris ) of Central and South American origin is the dominant edible-podded bean in the U.S., second to the soybean in importance. Third in importance is the broad, or fava, bean ( Vicia faba ), the principal bean of Europe. The lima bean ( P. limensis ), of Central American origin, is commercially important in few countries outside the Americas. The scarlet runner bean ( P. coccineus ) is native to the New World tropics and is grown in Europe for its attractive flowers and fleshy immature pods. The mung bean, or green gram ( P. aureus ), is native to India and grown extensively in the Orient for food.