Locust tree

Locust tree can mean:

Honey locust, (Gleditsia triacanthos), a leguminous tree with pods having a sweet, edible pulp
Black locust, (Robinia pseudoacacia), a leguminous tree with toxic pods but useful for making honey

Etymology

In North America and Greece the term "locust" (gr. akris) was applied to the pods of the carob tree, that somehow resemble the insect. By extension many other pod carrying trees have been called "locust tree". [1]

References