Leaves and branches arranged alternately

Stem has two thorns at base of leaf. Edge of leaflet having no teeth. Fruit looks like a pea pod. -- Black Locust
no thorns
No thorns at the base of the leaf.

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This key was developed by "bt" in June 1982. It was put into HTML format by Stephen Ostermiller in July 1997. Copies of the entire guide in zip format that may be taken to camp on a laptop are available to those who write.