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Black Locust 
Robinia pseudoacacia
Characteristics 
• Fairly tall tree, 40’-80’ 
• Bark brownish black, coarsely ridged and 
furrowed bark 
• Pinnately compound with up to 19 leaflets 
• Stipular spines on younger trees 
• White flowers 
• Fruit resembles brown pea pod 
• Orange and yellow color in fissures of bark
Ecology 
• Exotic that has been widely planted 
• Seen in town, agricultural areas 
• Tolerant to a wide range of soils 
• Nitrogen fixer 
• Twigs and inner bark toxic 
• Wide spreading root system makes them 
good for erosion control
Black locust
Black locust
Black locust
Black locust
Black locust
Black locust
Black locust

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Black locust

  • 1. Black Locust Robinia pseudoacacia
  • 2. Characteristics • Fairly tall tree, 40’-80’ • Bark brownish black, coarsely ridged and furrowed bark • Pinnately compound with up to 19 leaflets • Stipular spines on younger trees • White flowers • Fruit resembles brown pea pod • Orange and yellow color in fissures of bark
  • 3. Ecology • Exotic that has been widely planted • Seen in town, agricultural areas • Tolerant to a wide range of soils • Nitrogen fixer • Twigs and inner bark toxic • Wide spreading root system makes them good for erosion control