Land or marshy tuberous monoecious herbs or shrubs. Leaves long petioled, reticulate, ovate or sagittate-cordate, peltate, basal lobes obtuse. Spathe limb deciduous; spadix included. Appendage ± clavate. Male and female flowers separated by a zone of neuter organs. Ovary unilocular, with many ovules on axile placentas.