Black Locust
Robinia pseudoacacia · Fabaceae (Legume, Bean, or Pea family)
AI-generated identification · may be incorrect
Leaf Morphology
Leaf Type
Pinnately compound (deciduous)
Shape
Oblong to elliptical leaflets, typically 7 to 19 per leaf, with an entire margin and rounded to slightly notched apex.
Margin
Entire (smooth edges without teeth or lobes)
Arrangement
Alternate arrangement of compound leaves along the stem, with leaflets arranged oppositely or sub-oppositely along the central rachis.
Venation
Pinnate venation with a prominent central midrib and fine, feather-like lateral veins branching outward.
Key Features
Pinnately compound leaves with oval leaflets featuring entire margins, paired stipular spines at the nodes (though sometimes absent on older branches), and heavily furrowed rope-like bark.
Description
Robinia pseudoacacia is a medium to large deciduous tree known for its deeply furrowed, dark bark, thorny twigs, and fragrant, drooping clusters of white, pea-like flowers in spring. It develops an open, irregular crown and produces smooth, flat seed pods.
Habitat
Found in disturbed areas, forest edges, abandoned fields, and along roadsides. Prefers well-drained soils and full sun exposure, though it is highly adaptable to poor soils due to its nitrogen-fixing capabilities.
Native Range
Native to the Appalachian and Ozark regions of North America, but now widely naturalized throughout temperate North America, Europe, and parts of Asia. Often considered invasive outside its native range.