Analysis of information sources in references of the Wikipedia article "Thiết đậu" in Vietnamese language version.
The primary progenitor of the cultigen is evidently L. orientalis native to the Near East; the other species may have contributed some genetic diversity to the crop. L. culinaris (L. esculentus), the domesticate, differs from the wild species in having indehiscent pods, due to a single recessive gene, and nondormant seeds.
