Asparagus bean

Yardlong bean, illustration from the Japanese agricultural encyclopedia Seikei Zusetsu (1804)

The asparagus bean (Vigna unguiculata subsp. sesquipedalis) 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, snake bean, bodi, borboti, and bora. Despite the common name of "yardlong", the pods are actually only about half a yard long, so the subspecies name sesquipedalis (one-and-a-half-foot-long; 1.5 feet (0.50 yd)) is a more accurate approximation.