Trees, evergreen or semi-evergreen, trunk cylindric or slightly bulbous. Leaves entire or lobed, petiolate, stipulate, the stipules caducous. Inflorescence a panicle; bracts deciduous. Flowers unisexual. Calyx petaloid, tubular, 5- or 6-lobed; petals absent. Male flowers with c. 20 stamens arranged on an androgynophore and with a rudimentary 5-carpellate gynoecium. Female flowers with a gynoecium of 5 free carpels raised on an androgynophore, their styles cohering when young; staminodes present at base of carpels. Follicles (mature carpels) 5 or fewer, stalked, glabrous outside, stellate-hirsute inside; seeds embedded in a hairy, honeycomb-like tissue derived from the inner layer of the follicle.
30 species, mainly in tropical Australia, 2 in Papua New Guinea.