Green beans are young, unripe fruits of various cultivars of the common bean. Green beans are known by several common names, including French beans, string beans, and snap beans or simply "snaps".
A pile of raw green beans
Varieties of climbing French beans, from left: 'The Hunter,' 'Cosse Violette,' 'Rob Roy,' 'Rob Splashed,' 'Kingston Gold'
Green common beans on the plant
Green beans with bean slicer
The asparagus bean is a legume cultivated for its edible green pods containing immature seeds, like the green bean. It is also known as yardlong bean, pea bean, long-podded cowpea, Chinese long bean,
Green bean
…most modern varieties are "stringless"), and snap beans or simply "snaps". Immature or young pods of the runner bean (P. coccineus), yardlong bean (Vigna unguiculata subsp. sesquipedalis), and hyacinth bean (Lablab purpureus) are used in a similar way. Green beans are distinguished from the many other bean varieties in that they are…
Vigna unguiculata Blanco 2.286 cropped
Yardlong bean, illustration from the Japanese agricultural encyclopedia Seikei Zusetsu (1804)