Black locust

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Black locust Robinia pseudoacacia


A small deciduous tree, Robinia pseudoacacia, native to the Appalachian and Ozark Mountains of the United States. The black locust tree produces hard, tough wood used for outdoor construction, fence posts, and mine timbers. The tree is often planted along European streets because it is pretty and tolerates pollution well.

Synonyms and Related Terms

black locust (Robinia pseudoacacia); Gewöhnliche Robinie (Deut.); Falsche Akazie (Deut.); Silberregen (Deut.); robinier (Fr.); robinia (It.); falsa acacia (It.); robinia (Ned.); valse acacia (Ned., Port.); Robinia akacjowa (Pol.); false acacia; yellow locust

Other Properties

Medium tree growing to 15-25 m Bark=thick, fibrous gray to brown color Leaves = alternate pinnate Flowers=fragrant white hanging cluster (10 cm long) in late spring. Fruit = pale brown flat pod containing kidney shaped beans; ripens in fall.

Density 55-65 ppcf

Hazards and Safety

All parts of tree are considered toxic.

Additional Information

Schoch, W., Heller, I., Schweingruber, F.H., Kienast, F., 2004:Wood anatomy of central European Species: Locust,False Acacia, Robinia pseudoacacia L.

Sources Checked for Data in Record

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 462
  • F. H. Titmuss, Commercial Timbers of the World, The Technical Press Ltd., London, 1965 Comment: 55-65 ppcf
  • Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
  • Website address 1 Comment: Virginia Tech Dendrology website at (accessed Oct. 8, 2005)
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998

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