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Black Locust

Robinia pseudoacacia

Common Name: Black locust
Scientific Name: Robinia pseudoacacia
Family: Fabaceae
Growth Form: Tree
Native Range: The southern Appalachian region of the United States
Invasive Range: Temperate habitats throughout the world
Introduction: Black locust seeds are spread by birds, as well as through the nursery trade.
Description: ·Leaves: Blue-green compound leaves with 16-20 smooth, oblong leaflets.  Thorns of up to 2.2 cm (1 inch) flank the leaf scars

·Twigs: Smooth, with 3 bundle scars and false end bud.  Appear to zigzag. 

·Bark: Dark in color, deep anastamosing ridges.

·Flowers: Pendulous, fragrant white flowers appear in clusters from May to June. 

·Fruit: Flat, brown seed pod, 5-13 cm (2-6 inches) in length.

Threats: The black locust is useful in stopping erosion and as a primary colonizer after natural disasters.  But, it can spread from the roots, forming pure stands that out-compete native vegetation. 
Fun Facts: Black locust trees produce hard, durable, rot-resistant wood and are often planted as fence posts. 
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