Vigna indica T.M.Dixit, K.V.Bhat & S.R.Yadav, Rheedea 21(1): 1. 2011;
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Keys between V.indica, V.trilobata, V.aconitifolia, V.stipulacea available at efi thread;
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References:

http://www.theplantlist.org/tpl1.1/record/kew-2905330

http://www.ipni.org/ipni/idPlantNameSearch.do?id=77113750-1

http://www.iaat.org.in/Rheedea21_1-7.pdf (2011- Vigna indica, a new name for Vigna trilobata var. pusilla and a note on section Aconitifoliae in India by T.M. Dixit, S.P. Sutar, S.R. Yadav, K.V. Bhat and S.R. Rao) (Keys- Vigna aconitifolia, Vigna indica, Vigna khandalensis, Vigna stipulacea & Vigna trilobata)