Locust tree can mean:Any of a number of tree species in the genera Gleditsia or Robinia, including: Honey locust, a leguminous tree with pods having a sweet, edible pulp Black locust, a leguminous tree with toxic pods Water locust, a leguminous tree with one seed per pod Less commonly, "African locust bean tree", which is also known as néré Also not commonly, the carob tree, Ceratonia siliqua, whose pods are called locust beans