The azuki bean is an annual vine, Vigna angularis, widely grown throughout East Asia and the Himalayas for its small bean. The cultivars most familiar in Northeast Asia have a uniform red color. However, white, black, gray and variously mottled varieties are also known. Scientists presume Vigna angularis var. nipponensis is the progenitor. Genetic evidence indicates that the azuki bean was first domesticated in East Asia and later crossbred with native species in Himalayas.
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