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Vigna species

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Found this plant at Mbuyu.
Author: Genera: Gaetano Savi, 1824
Origin:  Tanzania
Soil:  Mix
Water:  Medium
Sun:  Medium - Maximum
Thickness:  ?
Height:  ?
Flower:  ?
Propagate:  Seeds/Cuttings
Names:  -
Synonyms:  -

I am having a hard time finding the species of this Vigna from Tanzania. Any suggestions will be appreciated: .

The genera name after Dominico Vigna, an Italian botanist of the 17th century.