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Fls paired, one of each sex on an axillary, bifurcated common stalk; perianth none; filament elongate; anther with (1)2(4) thecae and (2)4(8) microsporangia; pistillate fl subtended by a minute, membranous, initially closed cupule; ovaries (1–)4 or 5(–9), distinct, each with a slender style and peltate-funnelform stigma; fr a short-stipitate achene or drupelet with a warty dorsal ridge, terminated by the persistent, beak-like style; most lvs opposite, but the distal ones in seeming whorls of 3 or 4, the prominent, stipule-like sheath completely wrapped around the stem but free from the slender blade. Monotypic.
Roots single or in pairs at nodes. Leaves: blade entire, veins 1[--3], nearly terete. Inflorescence usually of 2 flowers, 1 staminate, 1 pistillate. Flowers short-pedicellate. Staminate flowers: anthers 4-loculed. Pistillate flowers: pistils surrounded proximally by membranaceous envelope; stigma asymmetrically funnel-shaped. Fruits: convex margin minutely dentate; endocarp often coarsely papillose (visible after decay of outer fruit wall); stipe developing into podogyne (stalk supporting pistil).
Morphological characters and geographical distribution are the same as those of the family.
