Vigna Savi

Eighty-five to 104 species, widespread in tropical and subtropical regions of the Old World; several species widely cultivated and occasionally escaped.

The generic circumscription of Vigna remains somewhat controversial. In the strict sense, there are probably 85–90 species in Vigna (Schrire, 2005). Phylogenetic study of selected members of the relatively large tribe Phaseoleae (Bronn) DC. using molecular data has suggested that a group of about 17 neotropical species traditionally included in Vigna is more closely related to some other New World genera than to the remainder of Vigna (Delgado-Salinas et al., 1993).