Monoecious or dioecious. Aerial leaves broadly to narrowly sagittate with 2 long, acute basal lobes, or some of them ovate to linear without basal lobes. Flowers in racemes or panicles; at least the lower bracts free. Petals 10-20 mm, white. Filaments of stamens linear, glabrous; anthers yellow. Fruitlets 2.5-4 mm, with a more or less elongated, horizontal ventral beak.