SAN FRANCISCO (KCBS) — String beans really should be called stringless beans. Originally they really did have a lot of strings—just take a look at the fava beans that you see at the market. That tough string that encapsulates the entire frame of the pod that holds the bean together inside.
In 1884 Calvin Keeney developed ‘Keeney’s Stringless Bean’ in Le Roy, New York. He worked over 6,000 acres and developed 18 other new beans that were all stringless.
The ones you find in the market today are all stringless. Some of the most common ones are: the French-filet beans; also called the haricot vert (the French name), Blue Lake, Romano and Chinese Long Beans.