Amorpha fruticosa is a species of flowering plant in the legume family (Fabaceae) known by several common names, including desert false indigo, false indigo-bush, and bastard indigobush. It is found wild in most of most of the contiguous United States, southeastern Canada, and northern Mexico, but it is probably naturalized in the northeastern and northwestern portion of its current range. The species is also present as an introduced species in Europe, Asia, and other continents. It is often cultivated as an ornamental plant, and some wild populations may be descended from garden escapees.
A. fruticosa grows as a glandular, thornless shrub which can reach 5 or 6 meters in height and spread to twice that in width. It is somewhat variable in morphology. The leaves are made up of many hairy, oval-shaped, spine-tipped leaflets. The inflorescence is a spike-shaped raceme of many flowers, each with a single purple petal and ten protruding stamens with yellow anthers. The fruit is a legume pod containing one or two seeds.
- 'Albiflora', with white flowers.
- 'Crispa', with curled leaves.
- 'Lewisii', with narrow leaves.
- 'Pendula', with arching branches, forming an dome shape.
- ^ Effect of new rotenoid glycoside from the fruits of Amorpha fruticosa LINNE on the growth of human immune cells. Hak Ju Lee, Ha Young Kang, Cheol Hee Kim, Hyo Sung Kim, Min Chul Kwon, Sang Moo Kim, Il Shik Shin and Hyeon Yong Lee, Cytotechnology, Volume 52, Number 3, 219-226, doi:10.1007/s10616-006-9040-5