Glabrous, perennial herbs with creeping rhizomes. Leaves or phyllodes erect from rhizome nodes, hollow, with thin transverse septa. Inflorescence a simple umbel, rarely compound, few-flowered; bracts inconspicuous. Flowers bisexual, white to purple; sepals minute; petals orbicular, apex acute, inflexed; nectary depressed or absent; style very short. Fruit ovoid or globose, sometimes compressed laterally; mericarp ribbed, ribs near mericarp junction thick and corky; carpophore absent.
13 species, in the Americas, New Zealand and Australia; 3 species in Australia, all endemic.