According to observations of naturalists and beekeepers.
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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 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 escapes.
It is registered amongst the most noxious invasive species in Europe. However, a growing body of scientific literature also points to the therapeutic potential of its chemical constituents. Due to the fact that A. fruticosa is an aggressive invasive species, it can provide an abundant and cheap resource of plant chemical constituents that can be utilized for therapeutic purposes.
This plant is present in at least 51 states/provinces in this country.
A. fruticosa grows as a glandular, thornless shrub which can reach 5 or 6 m (16 or 20 ft) 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.
A. fruticosa is a honey plant and an important food source for bees across its native and introduced range.
Acer rubrum (aka: Red maple, Scarlet maple)
Salix nigra (aka: Black willow, Swamp willow, Southwestern black willow, Gulf black willow, Scythe-leaved willow)
Acer saccharinum (aka: Silver maple, Soft maple)
Cercis canadensis (aka: Eastern redbud, Redbud, Cersis Reniformis)
Malus angustifolia (aka: American crab apple, Buncombe crab apple, Crabtree, Narrowleaf crab, Narrowleaf crab apple, Southern crab, Southern crab apple)
Aronia arbutifolia (aka: Red chokeberry)