Common name : Purple Bush-Bean Botanical name : Macroptilium atropurpureum Tamil name : Pudhar avarai ‘bush - bean’ Remains a protein source ; Prevents soil erosion ;So for soil conservation , this plant is contemplated ; Suits to grazing ; Fixes Nitrogen conspicuously ; Plant gives a protective covering in Banana plantations . In snapshot - Young pods and flowers 0f Macroptilium atropurpureum . Additional informations : Shot in Chennai (Tamilnadu, India) 4.5 kms off sea-shore ;