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Black Locust

Robinia pseudoacacia


Black Locust is a tree in the subfamily of the pea family. It is native to the southeastern United States, but has been widely planted and naturalized elsewhere in temperate North America, Europe, Southern Africa and Asia, and is considered an invasive species in some areas. With a trunk up to to 52 m tall, and leaves 10–25 cm long, pinnate with 9–19 oval leaflets. The intensely fragrant flowers are white, 8–20 cm long, and are considered edible when cooked. The fruit is a legume 5–10 cm long, containing 4–10 seeds. Although similar in general appearance to Honey locust, it lacks that tree's characteristic long branched spines on the trunk, instead having the pairs of short thorns at the base of each leaf; the leaflets are also much broader.


Black locust prefers full sun, well drained soils and little competition. It is commonly found in disturbed areas such as old fields, degraded woods, and roadsides.

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1 Comment

keithp2012 7 years ago

Black Locust

New York, USA

Lat: 40.70, Long: -73.35

Spotted on Sep 10, 2010
Submitted on Sep 10, 2010

Spotted for mission

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