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Dioecious trees, the trunk and branches stout and hollow. Leaves spiral, eccentrically peltate when mature; stipules fully amplexicaul and leaving a scar completely surrounding the stem. Inflorescences of spadicose spikes in digitate clusters. Staminate flowers: perianth tubular with a somewhat thickened porous operculum; stamens 2. Pistillate flowers: perianth tubular with thin shredding walls and a fleshy porous circumscissile operculum, the penicillate stigma barely exserted. Fruit a minute achene.
Trees, terrestrial, usually with stilt-roots; internodes hollow. Scars of the stipules transverse; petiole mostly with trichilia at the base; blade peltate, radially incised, main venation radial. Inflorescences digitate clusters of spikes, initially enveloped by a spathe, interfloral bracts absent. Perianth tubular; stamens 2; stigma penicillate to peltate. Fruit small, achene-like, endosperm present; cotyledons flat.
