String beans were probably named this way because the seeds look like strings.
The common green bean (Phaseolus vulgaris) is a plant in the family Fabaceae and is also known as green bean, garden bean, pole bean, cowpea, or black-eyed pea. It is cultivated for its edible seeds, which are also called beans. Green beans are a popular vegetable in many countries, especially in Europe, Asia, North America, and Latin America.
The edible pods of the green bean contain an edible seed. The beans are eaten cooked or raw. They are also used in soups, salads, and stir-fries. Green beans have a long history of use as food. They have been cultivated for more than 10,000 years. Today, they are grown all over the world.
Green beans are considered to be a healthy food, and they are rich in fiber, vitamins, and minerals. The name "string bean" is usually applied to a variety of green bean that is grown for its edible pods, not its seeds. The name was originally applied to the green bean because it had a stringy texture when cooked.