Also called false acacia (in 🇬🇧 Britain).
Part of
legume / pea family Fabaceae
in
order Fabales.
Native to central and eastern 🇺🇸 USA, although widely planted elsewhere.
🌎︎ Map by county (🇺🇸 USA-48),
🌎︎ map (🇨🇦 Canada, 🇺🇸 USA)
(colors),
🌎︎ map (North America, Central America). 
Invasive > learn+quiz
Invasive > 🌐︎ global
Invasive > 🌐︎ various
Invasive > 🇨🇦+🇺🇸 Canada+USA
Invasive > report it!
Invasive > 🇺🇸 USA
Invasive > Michigan
on No-Plant List by Seneca Nation of Indians. (pages 59 and 64)
Uses by native peoples
(Ethnobotany database)
On a list as being
☠︎ toxic, particularly in the fruits and seeds.
Most legumes (including this species) cooperate with a bacterium that fixes
atmospheric nitrogen into a form usable by plants and animals, allowing these legumes to grow in poorer soils, or have seeds and foliage higher in protein content, than non-legumes.
Robinia hosts caterpillars of 59 species
of butterflies and moths, in some areas.
This plant is also known to be a host for (in areas where invasive)
🐝︎ spotted lanternfly (SLF) Lycorma delicatula.
Often grows in clonal colonies
[1]
—look around for other stems!