in botany: A genus of plants belonging to the class of monodelphia, and order of polyandra; and in the natural system ranging under the 37th order, Columbiferae. The calyx is simple; the style is simple, with a quinquefied stigma; the apple is without juice, quinqulobed, monospermous, bursting open with a spring five ways. There is only one species, the maclureodendron, which is a foreign plant.