Black Locust
Robinia pseudoacacia · Fabaceae (Legume, pea, or bean family)
AI-generated identification · may be incorrect
Leaf Morphology
Leaf Type
Pinnately compound, deciduous
Shape
Oblong to ovate leaflets, typically 7 to 19 per leaf, arranged in pairs along a central rachis with a single terminal leaflet
Margin
Entire (smooth edges without teeth or lobes)
Arrangement
Alternate compound leaves arranged along the woody stems
Venation
Pinnate venation on individual leaflets with a prominent central midrib and fine secondary veins branching out
Key Features
Pinnately compound leaves with entire margins and rounded leaflet tips, paired thorns often present on twigs of mature trees, heavily furrowed dark bark, and pendulous clusters of white fragrant flowers
Description
Black Locust is a medium to large deciduous tree known for its deeply furrowed, dark brown, rope-like bark and fragrant, pendulous clusters of white, pea-like flowers in spring. The tree features strong, durable wood and compound leaves that fold up at night. It is a fast-growing pioneer species that enriches the soil through nitrogen fixation.
Habitat
Found in open woods, disturbed areas, along forest edges, roadsides, and abandoned fields; prefers well-drained soils and full sun exposure, highly adaptable to poor soils
Native Range
Native to the eastern United States, primarily the Appalachian region and the Ozark Plateau, but widely naturalized throughout North America, Europe, and parts of Asia