Princeton's WordNet

1. wild indigo, false indigo(noun)

   any of several plants of the genus Baptisia

2. false indigo, bastard indigo, Amorpha fruticosa(noun)

   dense shrub of moist riverbanks and flood plains of the eastern United States having attractive fragrant foliage and dense racemes of dark purple flowers

3. false indigo, bastard indigo, Amorpha californica(noun)

   an erect to spreading hairy shrub of the Pacific coast of the United States having racemes of red to indigo flowers