Polygamous or dioecious trees or shrubs, usually sapiferous; sap often irritant. Leaves compound. Flowers small, greenish, in axillary or terminal panicles. Calyx persistent, 4-6-lobed; lobes imbricate. Petals 4-6, spreading. Disk present. Stamens as many as or twice the number of petals; anthers bilocular, imperfect in the female flowers. Ovary unilocular; styles 3, usually free. Drupe small and dry.