Vigna angularis

Vigna angularis, also known as the adzuki bean (Japanese: 小豆, Hepburn: azuki), azuki bean, aduki bean, red bean, or red mung bean, is an annual vine widely cultivated throughout East Asia for its small (approximately 5 mm or 1⁄4 in long) bean. The cultivars most familiar in East Asia have a uniform red color, but there are white, black, gray, and variously mottled varieties. Scientists presume Vigna angularis var. nipponensis is the progenitor.