A considerable order of trees and shrubs with opposite or alternate simple leaves and minute stipules when present. Flowers very small, greenish or white. Calyx small, lobes imbricate. Petals 4 or 5, imbricate. Stamens 4 or 5, inserted on the disk, alternate with the petals. Fruit capsular (in Euony mus), 3- to 5-celled, dehiscing loculicidally, cells 1- or 2-seeded; seeds invested in an aril, albumen fleshy. Chiefly tropical, with the exception of the single genus included below.