The adzuki bean (Vigna angularis; from azuki (Japanese: アズキ（小豆）); sometimes transliterated as azuki or aduki), or English red mung bean, is an annual vine widely cultivated throughout East Asia for its small (approximately 5 millimetres (0.20 in) long) bean. The cultivars most familiar in Northeast Asia have a uniform red color, but white, black, gray, and variously mottled varieties also are known.

Scientists presume Vigna angularis var. nipponensis is the progenitor.

https://en.wikipedia.org/wiki/Adzuki_bean