WordNet sense 1 (East Indian shrub):

Tephrosia purpurea

WordNet sense 2 (dense shrub of moist riverbanks and flood plains of the eastern United States having attractive fragrant foliage and dense racemes of dark purple flowers):

false indigo, Amorpha fruticosa

WordNet sense 3 (an erect to spreading hairy shrub of the Pacific coast of the United States having racemes of red to indigo flowers):

Amorpha californica