INTRODUCTION The genus Vigna Fabaceae, formerly Leguminosae, is composed of more than 200 species that are native to the warm regions of both the old world and new world. Vigna is closely related to Phaseolus, which is composed of more than 20 species that are native to warm or tropical regions of the New World. A number of species previously placed in Phaseolus are now placed in Vigna. The gen...